The combination of photonic integrated circuits and free-space metaoptics has the ability to untie technological knots that require advanced light manipulation due to their conjoined ability to achieve strong light–matter interaction via wave-guiding light over a long distance and shape them via large space-bandwidth product. Rapid prototyping of such a compound system requires component interchangeability. This represents a functional challenge in terms of fabrication and alignment of high-performance optical systems. Here, we report a flexible and interchangeable interface between a photonic integrated circuit and the free space using an array of low-loss metaoptics and demonstrate multifunctional beam shaping at a wavelength of 780 nm. We show that robust and high-fidelity operation of the designed optical functions can be achieved without prior precise characterization of the free-space input nor stringent alignment between the photonic integrated chip and the metaoptics chip. A diffraction limited spot of ∼3 μm for a hyperboloid metalens of numerical aperture 0.15 is achieved despite an input Gaussian elliptical deformation of up to 35% and misalignments of the components of up to 20 μm. A holographic image with a peak signal-to-noise ratio of >10 dB is also reported.
Here, we demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide (WSe2) monolayer to a silicon nitride (SiN) metasurface. Via energy-momentum spectroscopy of the WSe2-metasurface system, we observed the characteristic anti-crossing of the polariton dispersion both in the reflection and photoluminescence spectrum. A Rabi splitting of 18 meV was observed which matched well with our numerical simulation. Moreover, we showed that the Rabi splitting, the polariton dispersion and the far-field emission pattern could be tailored with subwavelength-scale engineering of the optical meta-atoms.
In this paper, we will outline the architectures of photodetectors and light emitting diodes based on the van der Waals heterostructures. For the demonstrated photodetectors, we will show that they not only can exhibit the features of linear-dichroic, broadband and fast (> 200 MHz) photodetections at room temperature, but also can be useful for mid-infrared imaging applications. Regarding to the light emitters, we will show that the vdW-based light emitting diodes are applicable to the visible spectral region. In addition, the demonstrated vdW light emitting diodes can be further integrated with photonic crystal cavities, and the integration would significantly enhance the efficiency of light emission and lead to the high degree of linear polarized electroluminescence.
The recent advent of van der Waals (vdW) crystals are considered as a new class of material for optoelectronics or photonics applications, as they have a wide range of optical band gap energies and electrical transport properties. Furthermore, due to the nature of vdW interactions, these vdW materials can be transferred onto different substrates, making them a promising candidate for integrated photonics applications. Here, we will exploit these unique properties and describe how to realize ultrathin and integrable light sources, based on photonic crystal cavities integrated van der Waals light emitters. Our demonstrated device can be operated at room temperature with fast modulation speed and enhanced emission intensity. Additionally, we will show ultrathin (~0.14 λ) van der Waals metalenses, which not only can exhibit near diffraction-limited focusing and imaging, but also can be transferred onto flexible substrates to show strain- induced tunable focusing.
Layered materials have recently emerged as a promising class of optoelectronics material with high quantum efficiency of photo-emission, absorption and nonlinear optical properties. With significant progress in understanding the material science of these atomically thin materials, it is an opportune time to integrate these materials with existing optoelectronic platform to realize the full potential of the 2D materials. Integrating 2D material with nano-resonator could efficiently enhance the light-matter interaction and develop novel optoelectronics devices. Cavity-enhanced 2D material electro-optics modulation, nano-laser, and second order nonlinear devices has been demonstrated. In this paper, we report our recent progress on the cavity-integrated TMDC monolayer platform, including novel cavities for 2D material photonics and cavity nonlinear optics.
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