Prof. Hamed Dalir Profile

Prof. Hamed Dalir

Associate Professor at Univ of Florida

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

VCSEL , Optical Modulators , Photonics Integrated Circuits , AI Accelerator , Reservoir Computing , Quantum AI

Profile Summary

Dr. Dalir is an Associate Professor at the Department of Electrical and Computer Engineering at the University of Florida (UFL), where he leads a research team working on high-speed photonics computing, quantum AI, and cryptography. Dr. Dalir's research has been recognized with numerous awards, including the Yoshida Foundation Award for the Development of Future Leaders for Changing Times, and the Young Scientist Award from JSPS. He is also an Associate Editor of Printed Electronics and EPJ Quantum Technology journals.

Publications (80)

Proceedings Article | 24 October 2024 Poster + Paper

Poster + Paper

Motivating automated multimodal failure analysis for heterogeneously integrated devices

Patrick Craig, Nitin Varshney, Antika Roy, Charles Woychik, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 13152, 1315228 (2024) https://doi.org/10.1117/12.3028177

KEYWORDS: Advanced packaging, Failure analysis, X-rays, Acoustics, X-ray imaging, Nondestructive evaluation, Transducers, Signal to noise ratio, Defect detection, X-ray microscopy

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Proceedings Article | 24 October 2024 Poster + Paper

Poster + Paper

Exploring physics-informed machine learning for system matrix formulation in x-ray imaging forward models

Shajib Ghosh, Nitin Varshney, Md Mahfuz Al Hasan, Antika Roy, Patrick Craig, Sanjeev Koppal, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 13152, 131521W (2024) https://doi.org/10.1117/12.3027381

KEYWORDS: Matrices, X-ray imaging, X-rays, Machine learning, Sensors, Imaging systems, Signal attenuation, Data modeling, Image restoration, Signal detection

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This study presents an innovative approach to constructing a representative system matrix in x-ray imaging forward models. The approach leverages the combination of machine learning algorithms and fundamental physical principles through the use of physics-informed machine learning (PIML). The main goal is to seamlessly integrate machine learning algorithms with core physical principles to provide a nuanced perspective on the development of an interpretable and adaptive system matrix. In contrast to traditional data-intensive methods, this research intentionally prioritizes the incorporation of physics-based constraints into the machine learning framework. The methodology involves carefully extracting relevant features from x-ray imaging data to capture essential object characteristics, which are then integrated into a machine learning model. By including physics-based constraints, the model aligns with the underlying principles that govern x-ray interactions. Through rigorous mathematical validation and preliminary experimentation, the approach demonstrates its feasibility, particularly in situations where acquiring extensive datasets is challenging. From a technical standpoint, the strength of this methodology lies in the inherent adaptability and interpretability of the system matrix, which are crucial for accurate image reconstruction and measurement prediction. The implications of this research span diverse domains and highlight the potential transformative effects on x-ray imaging applications in electronics, medical imaging, and material inspection. In the realm of electronics, the adaptable system matrix improves non-destructive testing by aiding in defect detection and ensuring the reliability of electronic components. In medical imaging, enhanced interpretability leads to improved diagnostic accuracy while reducing radiation exposure. In material inspection, this approach facilitates the identification of structural anomalies and material composition, thereby advancing quality control practices. While recognizing the preliminary nature of the framework, this study lays the groundwork for future research at the intersection of machine learning and physics in x-ray imaging, representing a progressive step towards unlocking transformative possibilities for enhanced accuracy and adaptability across various domains.

Proceedings Article | 24 October 2024 Poster + Paper

Poster + Paper

Challenges and opportunities in non-destructive characterization of stacked IC packaging: insights from SAM and 3D x-ray analysis

Nitin Varshney, Shajib Ghosh, Patrick Craig, Himanandhan Reddy Kottur, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 13152, 1315225 (2024) https://doi.org/10.1117/12.3027317

KEYWORDS: Nondestructive evaluation, Inspection, X-rays, Packaging, Failure analysis, Advanced packaging, Acoustics, 3D image processing, X-ray microscopy, X-ray imaging

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Proceedings Article | 17 October 2024 Presentation + Paper

Presentation + Paper

Multi-modal printed circuit board netlist extraction with x-ray and optical imaging

Patrick Craig, Nitin Varshney, Antika Roy, Shajib Ghosh, Chandraman Patil, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 13152, 131520Q (2024) https://doi.org/10.1117/12.3027170

KEYWORDS: X-rays, X-ray imaging, Data modeling, X-ray optics, Reverse modeling, Optical imaging, Machine learning, Image segmentation, Design, Printing

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Proceedings Article | 3 October 2024 Presentation + Paper

Presentation + Paper

Optimizing deep learning performance in PCB x-ray inspection through synthetic data tuner

Shajib Ghosh, Md Mahfuz Al Hasan, Patrick Craig, Antika Roy, Nitin Varshney, Sanjeev Koppal, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 13138, 131380N (2024) https://doi.org/10.1117/12.3027380

KEYWORDS: Data modeling, Performance modeling, Education and training, RGB color model, X-rays, Gallium nitride, Inspection, Deep learning, Image classification, X-ray imaging

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In the domain of printed circuit board (PCB) X-ray inspection, the effectiveness of deep learning models greatly depends on the availability and quality of annotated data. The utilization of data augmentation techniques, particularly through the utilization of synthetic data, has emerged as a promising strategy to improve model performance and alleviate the burden of manual annotation. However, a significant question remains unanswered: What is the optimal amount of synthetic data required to effectively augment the dataset and enhance model performance? This study introduces the Synthetic Data Tuner, a comprehensive framework developed to address this crucial question and optimize the performance of deep learning models for PCB X-ray inspection tasks. By employing a combination of cutting-edge deep learning architectures and advanced data augmentation techniques, such as generative adversarial networks (GANs) and variational autoencoders (VAEs), the Synthetic Data Tuner systematically assesses the impact of different levels of synthetic data integration on model accuracy, robustness, and generalization. Through extensive experimentation and rigorous evaluation procedures, our results illustrate the intricate relationship between the quantity of synthetic data and model performance. We elucidate the phenomenon of diminishing returns, where model performance reaches a saturation point beyond a specific threshold of synthetic data augmentation. Moreover, we determine the optimal balance between synthetic and real data, achieving a harmonious equilibrium that maximizes performance improvements while mitigating the risk of overfitting. Additionally, our findings emphasize the significance of data diversity and quality in the generation of synthetic data, highlighting the importance of domain-specific knowledge and context-aware augmentation techniques. By providing insights into the complex interplay between synthetic data augmentation and deep learning model performance, the Synthetic Data Tuner not only advances the current state-of-the-art in PCB X-ray inspection but also offers valuable insights and methodologies applicable to various computer vision and industrial inspection domains.

Proceedings Article | 3 October 2024 Presentation + Paper

Presentation + Paper

SHIELD-PCB: securing hardware inspection with enhanced learning and defense against adversarial examples in printed circuit boards images

Shajib Ghosh, Antika Roy, Nitin Varshney, Patrick Craig, Md Mahfuz Al Hasan, Sanjeev Koppal, Hamed Dalir, Navid Asadi Zanjani

Proceedings Volume 13138, 131380O (2024) https://doi.org/10.1117/12.3027383

KEYWORDS: Inspection, Adversarial training, Education and training, Data modeling, Visual process modeling, Performance modeling, Computer vision technology, Defense and security, Systems modeling, Process modeling

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This study aims to investigate the potential of enhancing the resilience of computer vision systems in the context of intelligent Printed Circuit Board (PCB) inspection through the integration of techniques that filter out adversarial examples. PCBs, which are crucial components of electronic devices, require reliable inspection methods. However, current computer vision models are vulnerable to adversarial attacks that can compromise their accuracy. Our research introduces an evolving approach that combines advanced deep learning architectures with adversarial training methods. The initial steps involve training a robust PCB inspection model using a diverse dataset and generating adversarial examples through carefully designed perturbations. Subsequently, the model is exposed to these adversarial examples during a dedicated training phase, enabling it to adapt to variations introduced by potential adversaries. To counter the impact of adversarial examples on classification decisions during real-time inspections, a filtration mechanism is implemented to identify and discard them. Preliminary experimentation and ongoing evaluations demonstrate promising progress in enhancing the resilience of PCB inspection models against adversarial attacks. Although the filtration mechanism is still in its early stages, it shows potential in identifying and neutralizing potential threats, contributing to efforts aimed at strengthening the reliability and trustworthiness of inspection outcomes. Moreover, the adaptability of the proposed methodology to various PCB designs, including different components, orientations, and lighting conditions, indicates the potential for transformative advancements in computer vision systems in critical domains. This research underscores the need for continued investigation into the evolving landscape of adversarial example filtration, presenting a potential avenue for fortifying intelligent inspection systems against adversarial threats in PCB inspection and beyond.

Proceedings Article | 3 October 2024 Presentation

Presentation

Automated Identification and classification of 2D materials for enhanced rapid prototyping efficiency: integration of deep learning and image processing techniques

Peter J. Van Kirk, Isaac Yu, Nitin Varshney, Navid Asadi, Elham Heidari, Hamed Dalir, Chandraman Patil

Proceedings Volume PC13114, PC131140G (2024) https://doi.org/10.1117/12.3028199

KEYWORDS: 2D materials, Rapid manufacturing, Image processing, Deep learning, Image enhancement, Image classification, Prototyping, Materials science, Performance modeling, Mathematical optimization

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Proceedings Article | 2 October 2024 Presentation + Paper

Presentation + Paper

Orbital angular momentum beams multiplexing and demultiplexing using hybrid optical-electronic neural network

Jiachi Ye, Haoyan Kang, Salem Altaleb, Hao Wang, Chandraman Patil, Ehsan Madadi-Kandjani, Elham Heidari, Navid Asadizanjani, Hamed Dalir

Proceedings Volume 13113, 1311303 (2024) https://doi.org/10.1117/12.3031871

KEYWORDS: Spatial light modulators, Free space optics, Modulation, Photonic integrated circuits, Neural networks, Atmospheric optics

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Proceedings Article | 2 October 2024 Presentation + Paper

Presentation + Paper

Energy-efficient optical memory architecture using phase change memory: clock frequency trade-offs for edge computing

Belal Jahannia, Jiachi Ye, Salem Altaleb, Qian Cai, Ehsan Madadi-Kandjani, Navid Asadizanjani, Chandraman Patil, Elham Heidari, Hamed Dalir

Proceedings Volume 13113, 1311306 (2024) https://doi.org/10.1117/12.3032164

KEYWORDS: Energy efficiency, Internet of things, Computer architecture, Power consumption

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Proceedings Article | 2 October 2024 Presentation + Paper

Presentation + Paper

Optical data compression and hashing via 4f-based reconfigurable complex convolution module

Haoyan Kang, Jiachi Ye, Salem Altaleb, Hao Wang, Chandraman Patil, Ehsan Madadi-Kandjani, Elham Heidari, Navid Asadizanjani, Hamed Dalir

Proceedings Volume 13113, 1311304 (2024) https://doi.org/10.1117/12.3031873

KEYWORDS: Optical computing, Modulation, Convolution, Data processing, Computing systems, Phase shift keying, Spatial light modulators, Neural networks, Phase modulation, Signal processing

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Proceedings Article | 2 October 2024 Presentation + Paper

Presentation + Paper

Polarization-selective photodetector based on topological insulators for secure optical communications and sensing applications

Isaac Yu, Yashas Shivaram, Peter Van Kirk, Russell Schwartz, Nitin Varshney, Navid Asadi, Elham Heidari, Hamed Dalir, Chandraman Patil

Proceedings Volume 13110, 131100H (2024) https://doi.org/10.1117/12.3028404

KEYWORDS: Photodetectors, Bismuth, Polarization, Selenium, 2D materials, Light sources and illumination, Dielectrics, Optical communications, Photocurrent, Heterojunctions

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Proceedings Article | 30 September 2024 Presentation + Paper

Presentation + Paper

Harnessing exciton-strain interactions in 2D TMDCs for advanced sensing and photodetection

Chandraman Patil, Isaac Yu, Peter Van Kirk, Elham Heidari, Hamed Dalir

Proceedings Volume 13140, 1314004 (2024) https://doi.org/10.1117/12.3027818

KEYWORDS: Excitons, Waveguides, Photodetectors, Silicon nitride, Monolayers, Photonic devices, Visible radiation, Semiconducting wafers, Fabrication, Spectral response

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Proceedings Article | 18 April 2024 Presentation + Paper

Presentation + Paper

Photodetector for mid-infrared applications using few-layer vanadium carbide MXene

Salem Altaleb, Jiachi Ye, Belal Jahannia, Chandraman Patil, Hao Wang, Navid Asadizanjani, Elham Heidari, Hamed Dalir

Proceedings Volume PC12888, PC128880H (2024) https://doi.org/10.1117/12.3003232

KEYWORDS: Mid infrared, Photodetectors, Vanadium, Biomedical applications, Optoelectronics, Photocurrent, 2D materials, Materials properties, Biomedical optics, Sensors

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Proceedings Article | 11 April 2024 Presentation + Paper

Presentation + Paper

ITO-based spatial light modulators for potential integrations with VCSELS

Jiachi Ye, Yaliang Gui, Chaobo Dong, Martin Thomaschewski, Elham Heidari, Volker Sorger, Hamed Dalir, Hao Wang

Proceedings Volume PC12897, PC128970K (2024) https://doi.org/10.1117/12.3003215

KEYWORDS: Vertical cavity surface emitting lasers

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Proceedings Article | 13 March 2024 Presentation

Presentation

Ultra-dense 2D material based photodetector arrays on flexible substrates

Russell Schwartz, Chandraman Patil, Hamed Dalir, Volker Sorger

Proceedings Volume PC12888, PC128880G (2024) https://doi.org/10.1117/12.3001144

KEYWORDS: Photodetectors, 2D materials, Silica, Positron emission tomography, Polyimides, Polyethylene, Fabrication, Reliability, Annealing

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Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

The phase-change-material-based dynamic metalens with ITO heater

Jiachi Ye, Chen Shen, Hao Wang, Elham Heidari, Navid Asadizanjani, Volker Sorger, Hamed Dalir

Proceedings Volume 12897, 128970B (2024) https://doi.org/10.1117/12.3002587

KEYWORDS: Metalenses, Optical components

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Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

Sb2Te3/MoS2 heterojunction photodetector for broadband light detection ranging from visible to near-infrared wavelengths

Hao Wang, Jiachi Ye, Haoyan Kang, Belal Jahannia, Elham Heidari, Volker Sorger, Hamed Dalir

Proceedings Volume 12903, 129030J (2024) https://doi.org/10.1117/12.3002759

KEYWORDS: Photodetectors, Heterojunctions, Optoelectronics, Optoelectronic devices

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Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

Reconfigurable complex convolution module based optical data compression and hashing algorithm

Haoyan Kang, Jiachi Ye, Behrouz Movahhed Nouri, Belal Jahannia, Salem Altaleb, Hao Wang, Elham Heidari, Volker Sorger, Hamed Dalir

Proceedings Volume 12903, 129030D (2024) https://doi.org/10.1117/12.3003411

KEYWORDS: Optical computing, Convolution, Spatial light modulators

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Proceedings Article | 13 March 2024 Presentation

Presentation

PhotoFourier: accelerating convolutional neural network by employing silicon photonics Fourier transform

Nicola Peserico, Hangbo Yang, Hamed Dalir, Volker Sorger

Proceedings Volume PC12903, PC1290305 (2024) https://doi.org/10.1117/12.3003720

KEYWORDS: Silicon photonics, Fourier transforms, Convolutional neural networks, Convolution, Photodetectors, Analog to digital converters, Neural networks, Field programmable gate arrays, Video processing, Power consumption

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Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

Low-latency full precision optical convolutional neural network accelerator

Belal Jahannia, Jiachi Ye, Salem Altaleb, Nicola Peserico, Navid Asadizanjani, Elham Heidari, Volker Sorger, Hamed Dalir

Proceedings Volume 12903, 1290307 (2024) https://doi.org/10.1117/12.3003314

KEYWORDS: Optical computing, Computing systems, Power consumption, Convolutional neural networks, Neural networks, Matrix multiplication

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Proceedings Article | 13 March 2024 Presentation + Paper

Presentation + Paper

Optical memory in IoT devices: an energy-efficient approach using phase change materials

Belal Jahannia, Jiachi Ye, Salem Altaleb, Chandraman Patil, Elham Heidari, Volker Sorger, Nicola Peserico, Hamed Dalir

Proceedings Volume 12903, 1290305 (2024) https://doi.org/10.1117/12.3003184

KEYWORDS: Internet of things, Energy efficiency, Data storage, Binary data, Photonics

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Proceedings Article | 12 March 2024 Presentation + Paper

Presentation + Paper

Advanced 4f-based free-space optical system

Haoyan Kang, Jiachi Ye, Belal Jahannia, Salem Altaleb, Hao Wang, Elham Heidari, Navid Asadizanjani, Volker Sorger, Hamed Dalir

Proceedings Volume 12901, 1290107 (2024) https://doi.org/10.1117/12.3003237

KEYWORDS: Machine learning, Optical computing, Free space optics, Convolution

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Proceedings Article | 12 March 2024 Presentation + Paper

Presentation + Paper

OAM modes classification and demultiplexing via Fourier optical neural network

Jiachi Ye, Belal Jahannia, Haoyan Kang, Hao Wang, Elham Heidari, Navid Asadizanjani, Volker Sorger, Hamed Dalir

Proceedings Volume 12901, 1290108 (2024) https://doi.org/10.1117/12.3003172

KEYWORDS: Free space optics, Turbulence, Modulation, Spatial light modulators, Convolutional neural networks, Optical communications

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Proceedings Article | 12 March 2024 Presentation + Paper

Presentation + Paper

An efficient optical-based binary neural network hardware accelerator for harsh environments

Belal Jahannia, Jiachi Ye, Salem Altaleb, Chandraman Patil, Elham Heidari, Hamed Dalir

Proceedings Volume 12891, 1289104 (2024) https://doi.org/10.1117/12.3003287

KEYWORDS: Optical computing, Neural networks, Binary data, Artificial intelligence, Computing systems, Quantization, Computer hardware, Power consumption, Logic, Computer architecture

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Proceedings Article | 11 March 2024 Poster + Paper

Poster + Paper

Physical assurance for photonics devices

Liton Kumar Biswas, Nitin Varshney, Volker Sorger, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 12893, 1289315 (2024) https://doi.org/10.1117/12.3003243

KEYWORDS: Silicon photonics, Silicon, Packaging, Photonics, Inspection, Information security, Reliability, Manufacturing

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Proceedings Article | 11 March 2024 Presentation + Paper

Presentation + Paper

THz-TDS for IC packaging material changes detection under real-world conditions

Chengjie Xi, Nitin Varshney, Mohammad Shafkat Khan, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 12885, 128850B (2024) https://doi.org/10.1117/12.3004241

KEYWORDS: Packaging, Materials properties, Moisture, Polymers, Terahertz radiation, Epoxies, Counterfeit detection, Structural materials, Reliability, Refractive index

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Proceedings Article | 11 March 2024 Presentation + Paper

Presentation + Paper

Enhancing counterfeit detection of integrated circuits through machine learning-assisted THz-TDS analysis

Chengjie Xi, Nitin Varshney, Mohammad Shafkat Khan, Hamed Dalir, Navid Asadizanjani

Proceedings Volume 12885, 128850C (2024) https://doi.org/10.1117/12.3003766

KEYWORDS: Counterfeit detection, Terahertz radiation, Machine learning, Data modeling, Refractive index, Packaging, Inspection, Integrated circuits, Semiconductors

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Proceedings Article | 11 March 2024 Presentation + Paper

Presentation + Paper

Design and optimization of a high-speed ITO-plasmon-based asymmetric Mach-Zehnder interferometer modulator

Salem Altaleb, Jiachi Ye, Yaliang Gui, Elham Heidari, Volker Sorger, Hamed Dalir, Hao Wang

Proceedings Volume 12880, 1288004 (2024) https://doi.org/10.1117/12.3003419

KEYWORDS: Modulators, Design, Modulation, Electrooptic modulators, Plasmonics, Oxides, Signal attenuation, Mach Zehnder interferometers, Refractive index, Phase modulation

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Proceedings Article | 9 March 2024 Presentation

Presentation

Revolutionizing technology with the GaAs platform: leading the way in integrated photonics for next-generation computing and sensing solutions

Hamed Dalir, Belal Jahannia, Salem Altaleb, Jiachi Ye, Hao Wang, Chandraman Patil, Navid Asadizanjani, Elham Heidari, Babak Nikoobakht

Proceedings Volume PC12894, PC1289404 (2024) https://doi.org/10.1117/12.3002994

KEYWORDS: Laser bonding, Silicon photonics, Polymers, Photorefractive polymers, Laser sources, Silicon, Refractive index, Photons, Photodetectors, Connectors

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

A strain modulated and self-powered broadband photodetector based on MoS2/Sb2Te3 heterojunction

Hao Wang, Jiachi Ye, Haoyan Kang, Belal Jahannia, Salem Altaleb, Elham Heidari, Navid Asadizanjani, Volker Sorger, Hamed Dalir

Proceedings Volume 12651, 1265105 (2023) https://doi.org/10.1117/12.2682115

KEYWORDS: Photodetectors, Heterojunctions, Dark current, Optoelectronics, Photonic integrated circuits, 2D materials

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

Exciton strain mapping in 2D TMDCs for sensing and photodetection

Chandraman Patil, Jiachi Ye, Haoyan Kang, Hao Wang, Belal Jahannia, Salam Altaleb, Elham Heidari, Navid Asadizanjani, Volker Sorger, Hamed Dalir

Proceedings Volume 12651, 1265108 (2023) https://doi.org/10.1117/12.2682123

KEYWORDS: Photodetectors, Excitons, Waveguides, Nanophotonics, Monolayers, 2D materials, Silicon nitride, Integrated optics, Photonic integrated circuits, Silicon photonics

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Proceedings Article | 4 October 2023 Presentation + Paper

Presentation + Paper

Programmable photonic chips and applications

Nicola Peserico, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12647, 1264704 (2023) https://doi.org/10.1117/12.2678662

KEYWORDS: Silicon photonics, Neural networks, Laser bonding, Wavelength division multiplexing, Neurons, Silicon, Quantum technology applications, Quantum machine learning, Quantum chips, Power consumption

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Proceedings Article | 4 October 2023 Presentation + Paper

Presentation + Paper

PhotoFourier: silicon photonics joint transfer correlator for convolution neural network

Nicola Peserico, Shurui Li, Hangbo Yang, Hamed Dalir, Puneet Gupta, Volker Sorger

Proceedings Volume 12673, 1267307 (2023) https://doi.org/10.1117/12.2678666

KEYWORDS: Convolution, Silicon photonics, Neural networks, Receivers, Photodetectors, Microrings, Geometrical optics, Fourier transforms, Analog to digital converters, Wavelength division multiplexing

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Proceedings Article | 26 September 2023 Presentation + Paper

Presentation + Paper

Demultiplexing OAM beams via Fourier optical convolutional neural network

Jiachi Ye, Haoyan Kang, Hao Wang, Chen Shen, Belal Jahannia, Elham Heidari, Navid Asadizanjani, Mohammad-Ali Miri, Volker Sorger, Hamed Dalir

Proceedings Volume 12667, 1266706 (2023) https://doi.org/10.1117/12.2682108

KEYWORDS: Machine learning, Free space optics, Wireless communications, Multiplexing, Angular momentum, Nanophotonics, Photonics

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Proceedings Article | 17 March 2023 Presentation + Paper

Presentation + Paper

Power conservation version of application-specific photonic integrated circuit

Chen Shen, Nicola Peserico, Hamed Dalir, Behrouz Movahhed Nouri, Volker Sorger

Proceedings Volume 12425, 124250I (2023) https://doi.org/10.1117/12.2650178

KEYWORDS: Integrated optics, Partial differential equations, Analog electronics, Photodetectors, Photonic integrated circuits, 2D materials

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Proceedings Article | 17 March 2023 Presentation + Paper

Presentation + Paper

Broadband and self-driven photodetector based on MoS2/Sb2Te3 heterojunction

Chaobo Dong, Hao Wang, Yaliang Gui, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12423, 1242305 (2023) https://doi.org/10.1117/12.2651230

KEYWORDS: Photodetectors, Heterojunctions, Silicon, Integrated optics, 2D materials, Lithium, Molybdenum, Lithium niobate, Dark current, Optical modulators

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Proceedings Article | 17 March 2023 Presentation + Paper

Presentation + Paper

Design and testing of silicon photonic 4F system for convolutional neural networks

Nicola Peserico, Jiawei Meng, Hangbo Yang, Xiaoxuan Ma, Shurui Li, Hamed Dalir, Puneet Gupta, Chee Wei Wong, Volker Sorger

Proceedings Volume 12424, 124240L (2023) https://doi.org/10.1117/12.2650228

KEYWORDS: Photonics, Neural networks, Silicon photonics, Lithium, Photodetectors, Machine learning, Design and modelling, Convolutional neural networks, Microrings, Artificial neural networks

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

Presentation

Photonics ASICs: a promising approach toward high throughput, short latency, and parallelized computing hardware

Hamed Dalir

Proceedings Volume PC12438, PC124380A (2023) https://doi.org/10.1117/12.2650978

KEYWORDS: Photonics, Photonic integrated circuits, Energy efficiency, Signal detection, Signal attenuation, Sensors, Photodetectors, Matrices, Machine learning, Fiber optics

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Proceedings Article | 17 March 2023 Presentation

Presentation

Photonic-chip Fourier convolution processor

Nicola Peserico, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume PC12438, PC124380F (2023) https://doi.org/10.1117/12.2647183

KEYWORDS: Convolution, Image filtering, Silicon photonics, Photonic integrated circuits, Optoelectronics, Modulation, Machine learning, Image processing, Image classification, Electrooptic modulators

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Proceedings Article | 16 March 2023 Presentation + Paper

Presentation + Paper

Leveraging the advantages of photonics tensor core for secure, high-speed computing: an optical encryption approach

Behrouz Movahhed Nouri, Elham Heidari, Chandraman Patil, Benito Fernandez, Volker Sorger, Hamed Dalir

Proceedings Volume PC12438, PC124380B (2023) https://doi.org/10.1117/12.2649360

KEYWORDS: Quantum encryption, Oscillators, Complex systems, Standards development, Prototyping, Quantum hardware, Photonics, Analog electronics, Signal processing, Quantum processors

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

High-performance optoelectronics for integrated photonic neural networks

Martin Thomaschewski, Zibo Hu, Behrouz Movahhed Nouri, Yaliang Gui, Hao Wang, Salem Altaleb, Hamed Dalir, Volker Sorger

Proceedings Volume 12438, 124380W (2023) https://doi.org/10.1117/12.2650319

KEYWORDS: Neural networks, Photonics, Silicon, Quantum plasmonics, Quantum photonics, Quantum nanophotonics, Neurons, Integrated photonics, Integrated optics, Electro optics

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Photonic tensor core machine learning accelerator

Xiaoxuan Ma, Behrouz Movahhed Nouri, Nicola Peserico, Hamed Dalir, Volker Sorger

Proceedings Volume 12438, 124380D (2023) https://doi.org/10.1117/12.2647179

KEYWORDS: Silicon photonics, Photodetectors, Neural networks, Laser bonding, Photonic integrated circuits, Integrated optics, Design and modelling, Artificial intelligence

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Michelson interferometric methods for full optical complex convolution

Haoyan Kang, Jonathan George, Behrouz Movahhed Nouri, Maria Solyanik-Gorgone, Hamed Dalir, Volker Sorger

Proceedings Volume 12438, 1243803 (2023) https://doi.org/10.1117/12.2650952

KEYWORDS: Convolution, Spatial light modulators, Neural networks, Modulation, Phase modulation, Optical computing

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Training on the optical system: local search method

Zibo Hu, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12438, 1243807 (2023) https://doi.org/10.1117/12.2650147

KEYWORDS: Neural networks, Education and training, Integrated optics, Evolutionary algorithms, Lithium, Convolutional neural networks, Artificial neural networks, Optical networks, Design and modelling, Photodetectors

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Exploring the potential of high-speed 2D and 3D materials in silicon photonics

Hao Wang, Yaliang Gui, Elham Heidari, Haoyan Kang, Jiachi Ye, Chaobo Dong, Martin Thomaschewski, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12438, 1243806 (2023) https://doi.org/10.1117/12.2651068

KEYWORDS: Photodetectors, Graphene, 2D materials, Silicon photonics, Silicon, Modulation, Optical modulators, Lithium, Photonic integrated circuits, Electrooptic modulators

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Free-space optical multiplexed orbital angular momentum beam identification system using Fourier optical convolutional layer based on 4f system

Jiachi Ye, Maria Solyanik, Zibo Hu, Hamed Dalir, Behrouz Movahhed Nouri, Volker Sorger

Proceedings Volume 12436, 124360B (2023) https://doi.org/10.1117/12.2649451

KEYWORDS: Photonics, Neural networks, Free space optics, Turbulence, Convolutional neural networks, Multiplexing, Angular momentum

Read Abstract +

Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Reconfigurable focusing and defocusing meta lens using Sb2Se3 phase change material

Jiawei Meng, Nicola Peserico, Yaliang Gui, Haoyan Kang, Hamed Dalir, Behrouz Movahhed Nouri, Volker Sorger

Proceedings Volume 12432, 1243203 (2023) https://doi.org/10.1117/12.2648377

KEYWORDS: Antimony, Lithium, Silicon photonics, Neural networks, Nanophotonics, Metalenses, Sun, Silicon, Refractive index, Oxides

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Proceedings Article | 15 March 2023 Presentation

Presentation

Revolutionizing High-Speed Data Transmission: The Transverse Coupled Cavity VCSEL

Hamed Dalir, Elham Heidari, Behrouz Movahhed Nouri, Volker Sorger

Proceedings Volume PC12419, (2023) https://doi.org/10.1117/12.2650994

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Signal to noise ratio, Semiconductor lasers, Thermal effects, Sensors, Semiconductors, Resistance, Reliability, Photodetectors

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

30 GHz plasmonic slot MoTe2 photodetector integrated with silicon photonic circuits at telecom wavelength

Hao Wang, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12419, 124190C (2023) https://doi.org/10.1117/12.2651013

KEYWORDS: Photodetectors, 2D materials, Plasmonics, Waveguides, Silicon, Photonics, Graphene, Frequency response, Optoelectronic devices, Silicon photonics

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An experimental demonstration of a waveguide-integrated plasmonic slot photodetector based on MoTe2 with 30 GHz 3 dB roll-off bandwidth at telecom wavelength. To overcome the intrinsic low carrier mobility and weak light-matter interaction when applying two-dimensional material for optoelectronic devices, here we numerically and experimentally show a novel concept of the plasmonic slot structure to eliminate the transit time constant (τ=L^2/μV) from the device which is related to the material mobility. The nanometer-wide plasmonic slot offers a ‘squeezed’ mode that allows the 2d material can effectively absorb the light via band-to-band transitions with an overlap factor (Г) increasing more than 3 times compared to the bare waveguide structure. The ultra-narrow slot width reduces the carriers’ drift route to tens of nanometers and is only limited by the RC time constant. The MoTe₂ serves as the semiconducting light-absorbing material with its layer-dependent bandgap that encompasses the standard O-band wavelength for communications (1,260 nm -1,360 nm). The device's static performance under 1 V bias voltage also shows a high photoresponsivity of 0.8 A/W at 1310 nm with a low dark current of 90 nA. Furthermore, we study the slot width-dependent frequency response and static response to validate our concept, which shows that both the frequency and static response are inversely proportional to the slot width. The concept is not restricted to materials and the platform. This may pave the way for developing high-performance optoelectronic devices with materials that have unique optical and electric properties but suffer from low mobilities.^1–13 It has been shown that introducing plasmonic structures, cavities, resonators, or nanoparticles into waveguide-loaded systems can improve light-matter interactions.^14–17 Still, one of their biggest challenges today is the frequency response of TMDCbased devices for telecommunications or information processing.^18–30 For photodetectors using TMDCs as the lightabsorbing medium, this is particularly crucial.

Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

Ultrafast charge and field driven optical modulators and switches

Martin Thomaschewski, Yaliang Gui, Hao Wang, Behrouz Movahhed Nouri, Salem Altaleb, Hamed Dalir, Volker Sorger

Proceedings Volume 12419, 124190E (2023) https://doi.org/10.1117/12.2650936

KEYWORDS: Plasmonics, Quantum nanophotonics, Electrooptic modulators, Electro optics, Quantum plasmonics, Photodetectors, Lithium, Waveguides, Optical properties, Neural networks

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Proceedings Article | 10 March 2023 Presentation + Paper

Presentation + Paper

Black-box simulation method: train the optical model from output

Zibo Hu, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12415, 124150K (2023) https://doi.org/10.1117/12.2650039

KEYWORDS: Neural networks, Education and training, Integrated optics, Design and modelling, Lithium, Artificial neural networks, Free space optics, Convolutional neural networks, Photodetectors, Optical networks

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Proceedings Article | 3 October 2022 Presentation + Paper

Presentation + Paper

Batch processing and data streaming Fourier-based convolutional neural network accelerator

Zibu Hu, Shurui Li, Russell L. Schwartz, Maria Solyanik-Gorgone, Behrouz Movahhed Nouri, Mario Miscuglio, Puneet Gupta, Hamed Dalir, Volker Sorger

Proceedings Volume 12204, 1220409 (2022) https://doi.org/10.1117/12.2633917

KEYWORDS: Diffraction, Convolution, Image processing, Data processing, Digital micromirror devices, Convolutional neural networks, Machine learning, Quantization, Electronics, Binary data

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Proceedings Article | 3 October 2022 Presentation + Paper

Presentation + Paper

High-performance opto-electronics with emerging materials

Hao Wang, Martin Thomaschewski, Chandraman Patil, Yaliang Gui, Behrouz Movahhed Nouri, Hamed Dalir, Volker Sorger

Proceedings Volume 12200, 1220002 (2022) https://doi.org/10.1117/12.2639327

KEYWORDS: Photodetectors, Graphene, Modulators, Optoelectronic devices, Optoelectronics, Silicon photonics, Photonics, Absorption, Plasmonics, Modulation

Read Abstract +

Proceedings Article | 3 October 2022 Presentation

Presentation

High-speed secure optical hashing for transformational computing (Conference Presentation)

Maria Gorgone-Solyanik, Behrouz Movahhed Nouri, Haoyan Kang, Hamed Dalir, Volker Sorger

Proceedings Volume PC12225, PC1222508 (2022) https://doi.org/10.1117/12.2633919

KEYWORDS: Network security, Cryptography, Computer security

Read Abstract +

Proceedings Article | 3 October 2022 Presentation

Presentation

Challenges and opportunities in 2D materials for optical modulation/detection

Behrouz Movahhed Nouri, Hamed Dalir

Proceedings Volume PC12200, PC122000F (2022) https://doi.org/10.1117/12.2639333

KEYWORDS: Graphene, Modulation, Absorption, Electrodes

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Presentation

Mid-infrared optical phased array beam steering on an InP-based platform

Jason Midkiff, Kyoung Min Yoo, Jong-Dug Shin, Hamed Dalir, Ray Chen

Proceedings Volume 11692, 116920G (2021) https://doi.org/10.1117/12.2579467

KEYWORDS: Phased array optics, Mid-IR, Beam steering, LIDAR, Wavelength tuning, Waveguides, Thermal optics

Read Abstract +

Proceedings Article | 10 March 2020 Presentation

Presentation

Suspended InGaAs membrane waveguide devices with subwavelength gratings and photonic crystal structures for ammonia sensing at lambda=6.15um (Conference Presentation)

Kyoung Min Yoo, Jason Midkiff, Ali Rostamian, Hamed Dalir, Ray Chen

Proceedings Volume 11276, 1127610 (2020) https://doi.org/10.1117/12.2546430

KEYWORDS: Waveguides, Indium gallium arsenide, Photonic crystals, Structural sensing, Quantum cascade lasers, Mid-IR, Sensors, Wave propagation, Group III-V semiconductors, Semiconductors

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

Presentation

Extra Loss-free Non-Hermitian Engineered Single Mode Laser Systems (Conference Presentation)

Mohammad Teimourpour, Elham Heidari, Hamed Dalir, Ray Chen, Volker Sorger

Proceedings Volume 11286, 112860V (2020) https://doi.org/10.1117/12.2546658

KEYWORDS: Vertical cavity surface emitting lasers, Semiconductor lasers, Space operations, Diffraction, Laser resonators, Lasers, Space sensors, LIDAR, Sensors, Reflectivity

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

Presentation

VCSEL with Multiple Transverse Coupled Cavities for Ultra-Wide Bandwidth (Conference Presentation)

Elham Heidari, Hamed Dalir, Moustafa Ahmed, Mohammad H. Teimourpour, Volker Sorger, Ray Chen

Proceedings Volume 11286, 112861B (2020) https://doi.org/10.1117/12.2547215

KEYWORDS: Graphene, Waveguides, Optical modulators, Modulation, Absorption, Waveguide modes, Light wave propagation, L band, Geometrical optics, Optical design

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Proceedings Article | 9 March 2020 Presentation

Presentation

Integrated ultra-high-performance graphene optical modulator (Conference Presentation)

Hamed Dalir, Elham Heidari, Aref Asghari, Mohammad Hosain Teimourpour, Volker Sorger, Ray Chen

Proceedings Volume 11309, 113090G (2020) https://doi.org/10.1117/12.2547098

KEYWORDS: Graphene, Optical modulators, Modulators, Absorption, Electronic circuits, Fabry–Perot interferometry, Modulation

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Proceedings Article | 9 March 2020 Presentation

Presentation

Photonic convolutional processor for network edge computing (Conference Presentation)

Mario Miscuglio, Puneet Gupta, Aydin Babakhani, Chee Wei Wong, Hamed Dalir, Tarek El-Ghazawi, Volker Sorger

Proceedings Volume 11299, 112990K (2020) https://doi.org/10.1117/12.2545970

KEYWORDS: Computer networks, Data processing, Optical computing, Digital micromirror devices, Convolution, Image processing, Neural networks, Spatial filters, Electronics, Optical filters

Read Abstract +

Proceedings Article | 9 March 2020 Presentation

Presentation

Compressed Sensing Fourier Transform Spectroscopy (Conference Presentation)

Elham Heidari, Hamed Dalir, Volker Sorger, Ray Chen

Proceedings Volume 11285, 112851F (2020) https://doi.org/10.1117/12.2549059

KEYWORDS: Spectroscopy, Fourier transforms, Plasmonics, Vertical cavity surface emitting lasers, Compressed sensing, Fourier spectroscopy, Integrated circuit design, Integrated circuits, Spectral resolution, Integration

Read Abstract +

Proceedings Article | 5 March 2020 Paper

Paper

High speed graphene optoelectronic devices enabled through controlled molecularly doped graphene

Aref Asghari, Hamed Dalir, Volker Sorger, Ray Chen

Proceedings Volume 11282, 1128216 (2020) https://doi.org/10.1117/12.2546801

KEYWORDS: Graphene, Doping, Optoelectronic devices, Resistance, Electrodes, Adsorption, Thin films, Computer engineering, Optical modulators, Switches

Read Abstract +

Proceedings Article | 2 March 2020 Paper

Paper

Monolithic integration of quantum cascade laser, quantum cascade detector, and passive components for absorption sensing at [lambda] = 4.6 μm

Jason Midkiff, Kyoung Min Yoo, Hamed Dalir, Ray Chen

Proceedings Volume 11288, 112882F (2020) https://doi.org/10.1117/12.2546327

KEYWORDS: Quantum cascade lasers, Sensors, Waveguides, Etching, Absorption, Quantum chromodynamics, Optical lithography, Dry etching, Quantum computing, Computer engineering

Read Abstract +

Proceedings Article | 28 February 2020 Paper

Paper

Parts-per-million level detection of carbon monoxide using grating array waveguides in InP/InGaAs at [lambda] = 4.6μm

Ali Rostamian, Jason Midkiff, Kyoung Min Yoo, Hamed Dalir, Ray Chen

Proceedings Volume 11288, 112882G (2020) https://doi.org/10.1117/12.2546593

KEYWORDS: Waveguides, Carbon monoxide, Indium gallium arsenide, Mid-IR, Sensors, Etching, Cladding, Plasma etching, Photonics, Alternate lighting of surfaces

Read Abstract +

Proceedings Article | 19 March 2019 Paper

Paper

Non-Hermitian engineered single-mode laser array

Mohammad Teimourpour, Elham Heidari, Hamed Dalir, Volker Sorger, Ray Chen

Proceedings Volume 10924, 1092418 (2019) https://doi.org/10.1117/12.2509107

KEYWORDS: Lasers, High power lasers, LIDAR

Read Abstract +

Proceedings Article | 19 March 2019 Paper

Paper

Ultrafast graphene photonics for futuristic generation of datacoms

Elham Heidari, Zhizhen Ma, Hamed Dalir, Vahid Esfandyarpour, Volker Sorger, Ray Chen

Proceedings Volume 10924, 1092419 (2019) https://doi.org/10.1117/12.2509155

KEYWORDS: Waveguides, Graphene, Silicon, Ultrafast phenomena, Photonics, Data communications, Modulators, Light, Modulation, Absorption

Read Abstract +

Proceedings Article | 18 March 2019 Paper

Paper

Bottom to in-plane grating coupler with high coupling efficiency and directionality

Yixin Chen , Bin Ai , Elham Heidari, Bonnie Dunbar, Volker Sorger, Zi Jing Wong, Ray Chen, Hamed Dalir

Proceedings Volume 10917, 109171X (2019) https://doi.org/10.1117/12.2510839

KEYWORDS: Diffraction gratings, Geometrical optics, Optical design, Etching, Silicon, Optical simulations, Diffraction, Reflectivity, Fiber couplers, Structured optical fibers

Read Abstract +

Proceedings Article | 8 March 2019 Presentation

Presentation

Compact graphene plasmonic slot photodetector on silicon-on-insulator with high responsivity (Conference Presentation)

Zhizhen Ma, Kazuya Kikunage, Hao Wang, Shuai Sun, Rubab Amin, Mario Miscuglio, Hamed Dalir, Volker Sorger

Proceedings Volume 10927, 109270V (2019) https://doi.org/10.1117/12.2524228

KEYWORDS: Graphene, Photodetectors, Plasmonics, Silicon, Electro optics, Photonic devices, Photovoltaics, Physics, Optoelectronics

Read Abstract +

Proceedings Article | 8 March 2019 Presentation

Presentation

2D materials in micro- and nanocavities (Conference Presentation)

Volker Sorger, Rishi Maiti, Mohammad Tahersima, Rohit Hemnani, Hamed Dalir, Ritesh Agarwal

Proceedings Volume 10920, 109200H (2019) https://doi.org/10.1117/12.2509807

KEYWORDS: Electro optics, Quantum wells, Switching, Photonics, Silicon, Silicon photonics, Microrings, Resonators, Ellipsometry, Modulation

Read Abstract +

Proceedings Article | 5 March 2019 Presentation

Presentation

Energy-efficient graphene and ITO-based MZI and absorption modulators (Conference Presentation)

Volker Sorger, Rubab Amin, Zhizhen Ma, Ray Chen, Hamed Dalir

Proceedings Volume 10914, 109140M (2019) https://doi.org/10.1117/12.2509723

KEYWORDS: Graphene, Modulators, Absorption, Silicon, Electro optics, Silicon photonics, Fast packet switching, Modulation, Resistance, Plasmons

Read Abstract +

Proceedings Article | 4 March 2019 Presentation

Presentation

Monolithically Integrated TCC VCSELs with Surface-normal 2D Slow-light PC Waveguide Arrays (Conference Presentation)

Hamed Dalir, Elham Heidari, Mohammad Hosain Teimourpour, Mario Miscuglio, Volker Sorger, Ray Chen

Proceedings Volume 10924, 109240S (2019) https://doi.org/10.1117/12.2512990

KEYWORDS: Photonic integrated circuits, Vertical cavity surface emitting lasers, Mirrors, Reflectivity, Light emitting diodes, Distributed Bragg reflectors, Semiconducting wafers, Quantum wells, Refractive index, Lab on a chip

Read Abstract +

Proceedings Article | 4 March 2019 Paper

Paper

Integrated photonics for NASA applications

Michael Krainak, Mark Stephen, Elisavet Troupaki, Sarah Tedder, Baraquiel Reyna, Jonathan Klamkin, Hongwei Zhao, Bowen Song, Joseph Fridlander, Minh Tran, John Bowers, Keren Bergman, Michal Lipson, Anthony Rizzo, Ipshita Datta, Nathan Abrams, Shayan Mookherjea, Seng-Tiong Ho, Qiang Bei, Yingyan Huang, Yongming Tu, Behzad Moslehi, James Harris, Andrey Matsko, Anatoliy Savchenkov, Guangyao Liu, Roberto Proietti, S. J. Yoo, Leif Johansson, Christophe Dorrer, Francisco Arteaga-Sierra, Jie Qiao, Songbin Gong, Tingyi Gu, Osgar John Ohanian, Xingjie Ni, Yimin Ding, Yao Duan, Hamed Dalir, Ray Chen, Volker Sorger, Tin Komljenovic

Proceedings Volume 10899, 108990F (2019) https://doi.org/10.1117/12.2509808

KEYWORDS: Waveguides, Modulation, Silicon, Modulators, Photonic integrated circuits, Graphene, Oscillators, Integrated photonics, Integrated optics, Silicon photonics

Read Abstract +

NASA is working with US industry and academia to develop Photonic Integrated Circuits (PICs) for: (1) Sensors (2) Analog RF applications (3) Computing and free space communications. The PICs provide reduced size, weight, and power that is critical for space-based systems. We describe recent breakthrough 3D monolithic integration of photonic structures, particularly high-speed graphene-silicon devices on CMOS electronics to create CMOS-compatible highbandwidth transceivers for ultra-low power Terabit-scale optical communications. An integrated graphene electro-optic modulator has been demonstrated with a bandwidth of 30 GHz. Graphene microring modulators are especially attractive for dense wavelength division multiplexed (DWDM) systems. For space-based optical communication and ranging we have demonstrated generating a variable number of channels from a single laser using breadboard components, using a single-sideband carrier-suppressed (SSBCS) modulator driven by an externally-supplied RF tone (arbitrary RF frequency), a tunable optical bandpass filter, and an optical amplifier which are placed in a loop. We developed a Return--to-Zero (RZ) Differential Phase Shift Keying (DPSK) laser transmitter PIC using an InP technology platform that includes a tunable laser, a Semiconductor Optical Amplifier (SOA), high-speed Mach-Zehnder Modulator (MZM), and an electroabsorption (EAM) modulator. A Silicon Nitride (SiN) platform integrated photonic circuit suitable for a spectrally pure chip-scale tunable opto-electronic RF oscillator (OEO) that can operate as a flywheel in high precision optical clock modules, as well as radio astronomy, spectroscopy, and local oscillator in radar and communications systems is needed. We have demonstrated a low noise optical frequency combs generation from a small OEO prototypes containing very low loss (~1 dB) waveguide couplers of various shapes and sizes integrated with an ultrahigh-Q MgF2 resonators. An innovative miniaturized lab-on-a-chip device is being developed to directly monitor astronaut health during missions using ~3 drops of body fluid sample like blood, urine, and potentially other body fluids like saliva, sweat or tears. The first-generation system comprises a miniaturized biosensor based on PICs (including Vertical Cavity Surface Emitting Laser – VCSEL, photodetector and optical filters and biochemical assay that generates a fluorescent optical signal change in response to the target analyte.

Proceedings Article | 23 April 2018 Paper

Paper

Low-loss high-speed plasmonic optical modulator based on adiabatic waveguides

Farzad Mokhtari-Koushyar, Elham Heidari, Hamed Dalir, Iman Zand, Shuai Sun, Volker Sorger, Ray Chen

Proceedings Volume 10538, 105381A (2018) https://doi.org/10.1117/12.2287034

KEYWORDS: Waveguides, Plasmonics, Modulation, Nanophotonics, Modulators, Light wave propagation, Optical modulators, Computer engineering, Silicon, Sun

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Proceedings Article | 14 March 2018 Presentation

Presentation

Ultra-dense ultra-high speed optical waveguides with sub-wavelength spacing (Conference Presentation)

Iman Zand, Hamed Dalir, Elham Heidari, Fazard Mokhtari-Koushyar, Volker Sorger, Ray Chen

Proceedings Volume 10526, 1052618 (2018) https://doi.org/10.1117/12.2291070

KEYWORDS: Waveguides, Finite-difference time-domain method, Directional couplers, Wave propagation, Telecommunications, Packaging, Multiplexing, Optoelectronic devices, Instrument modeling, Wavelength division multiplexing networks

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Proceedings Article | 2 March 2018 Paper

Paper

High-speed modulator based on electro-optic polymer infiltrated subwavelength grating waveguide ring resonator

Zeyu Pan, Xiaochuan Xu, Chi-Jui Chung, Hamed Dalir, Hai Yan, Ke Chen, Yaguo Wang, Baohua Jia, Ray Chen

Proceedings Volume 10538, 105381E (2018) https://doi.org/10.1117/12.2291366

KEYWORDS: Silicon, Waveguides, Modulators, Electro optic polymers, Optical interconnects, Resonators, Polymer multimode waveguides, Polymers, Optical modulators, Sensors

Read Abstract +

Proceedings Article | 20 February 2018 Paper

Paper

ultrasensitive spectroscopy based on photonic waveguides on Al2O3/SiO2 platform

Elham Heidari, Xiaochuan Xu, Naimei Tang, Farzad Mokhtari-Koushyar, Hamed Dalir, Ray Chen

Proceedings Volume 10501, 105011D (2018) https://doi.org/10.1117/12.2289151

KEYWORDS: Proteins, Waveguides, Aluminum, Spectroscopy, Light-matter interactions, Ultraviolet radiation, Cancer, Absorption, Absorbance, Optical spectroscopy

Read Abstract +

Proceedings Article | 27 February 2014 Paper

Paper

Ultrafast direct modulation of transverse-mode coupled-cavity VCSELs far beyond the relaxation oscillation frequency

Hamed Dalir, Fumio Koyama

Proceedings Volume 9001, 900106 (2014) https://doi.org/10.1117/12.2042232

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Signal attenuation, Eye, Near field optics, Ultrafast phenomena, Transistors, Oxides, Capacitance, Mirrors

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Proceedings Article | 27 February 2014 Paper

Paper

In-plane integration of VCSEL with photo-detector by using laterally coupled cavities

Hamed Dalir, Fumio Koyama

Proceedings Volume 9001, 900108 (2014) https://doi.org/10.1117/12.2042250

KEYWORDS: Vertical cavity surface emitting lasers, Oxides, Laser damage threshold, Mirrors, Coating, Modulation, Semiconducting wafers, Electrodes, Silica, Oxidation

Read Abstract +

Proceedings Article | 13 March 2013 Paper

Paper

Push-pull modulation of lateral coupling of dual VCSEL cavities using a bow-tie shape

Hamed Dalir, Akihiro Matsutani, Fumio Koyama

Proceedings Volume 8639, 86390W (2013) https://doi.org/10.1117/12.2003692

KEYWORDS: Vertical cavity surface emitting lasers, Modulation, Scattering, Switching, 3D modeling, Oxides, Waveguides, Slow light, Light scattering, Phase shift keying

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Showing 5 of 80 publications

Conference Committee Involvement (8)

Low-Dimensional Materials and Devices 2025

3 August 2025 | San Diego, California, United States

Vertical-Cavity Surface-Emitting Lasers XXIX

29 January 2025 | San Francisco, California, United States

Optical Power Delivery

28 January 2025 | San Francisco, California, United States

Low-Dimensional Materials and Devices 2024

19 August 2024 | San Diego, California, United States

Low-Dimensional Materials and Devices 2023

21 August 2023 | San Diego, California, United States

Showing 5 of 8 Conference Committees

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