Prof. Tao Chu Profile

Prof. Tao Chu

at Zhejiang University

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 28 November 2023 Paper

On-chip beam steering in gradient-index waveguide arrays

Yunfei Niu, Qingyang Du, Shaoliang Yu, Tao Chu

Proceedings Volume 12764, 127640S (2023) https://doi.org/10.1117/12.2687110

KEYWORDS: Waveguides, Diffraction, Beam steering, Light wave propagation, Silicon nitride, Quantum systems, Wave propagation, Scanning electron microscopy, Wavefronts, Refractive index

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Proceedings Article | 4 November 2016 Paper

Large-scale silicon optical switches for optical interconnection

Lei Qiao, Weijie Tang, Tao Chu

Proceedings Volume 10027, 1002705 (2016) https://doi.org/10.1117/12.2248412

KEYWORDS: Waveguides, Networks, Phase shifts, Computing systems, Silicon, Switches, Optical switching, Electro optics, Optical interconnects, Data centers

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Proceedings Article | 9 February 2007 Paper

Silicon photonic-wire waveguide devices

Tao Chu, Hirohito Yamada, Shigeru Nakamura, Makoto Tojo, Yutaka Urino, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6477, 647709 (2007) https://doi.org/10.1117/12.701519

KEYWORDS: Waveguides, Silicon photonics, Switches, Optical switching, Silicon, Switching, Optical components, Multiplexers, Silica, Cladding

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Proceedings Article | 23 October 2006 Paper

Optical add-drop multiplexer with hexagonal-hole lattice PC slab waveguides

Akiko Gomyo, Jun Ushida, Masayuki Shirane, Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6376, 63760J (2006) https://doi.org/10.1117/12.688568

KEYWORDS: Photonic crystals, Waveguides, Reflectors, Multiplexers, Transmittance, Silicon, Crystals, Optical filters, Interfaces, Light wave propagation

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Proceedings Article | 13 October 2006 Paper

Reconfigurable optical add-drop multiplexer (R-OADM) based on silicon photonic crystal slab waveguides

Tao Chu, Hirohito Yamada, Akiko Gomyo, Jun Ushida, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6376, 63760I (2006) https://doi.org/10.1117/12.688125

KEYWORDS: Silicon, Photonic crystals, Waveguides, Wavelength division multiplexing, Optical switching, Multiplexers, Silicon photonics, Thermal optics, Switches, Crystals

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Proceedings Article | 4 October 2006 Paper

Photonic crystal slab and Si-wire waveguide devices

Hirohito Yamada, Tao Chu, Akiko Gomyo, Jun Ushida, Masayuki Shirane, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6351, 635122 (2006) https://doi.org/10.1117/12.690987

KEYWORDS: Waveguides, Optical switching, Optical components, Photonic crystals, Switches, Switching, Silicon, Thermal optics, Optical resonators, Fiber Bragg gratings

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Proceedings Article | 6 December 2005 Paper

Optical add-drop multiplexer using PBG with hexagonal-hole lattice PC slab waveguides

Akiko Gomyo, Jun Ushida, Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6050, 60500B (2005) https://doi.org/10.1117/12.651989

KEYWORDS: Reflectors, Waveguides, Transmittance, Photonic crystals, Silicon, Multiplexers, Semiconducting wafers, Optical filters, Polarization, Finite-difference time-domain method

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Proceedings Article | 3 December 2005 Paper

Si-nanowire optical waveguide devices for optical communications

Hirohito Yamada, Tao Chu, Satomi Ishida, Yasuhiko Arakawa

Proceedings Volume 6019, 60192X (2005) https://doi.org/10.1117/12.637076

KEYWORDS: Waveguides, Optical components, Silicon, Polarization, Directional couplers, Integrated optics, Multiplexers, Absorption, Semiconducting wafers, Silica

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Si-nanowire waveguides are attractive structures for constructing various optical devices that are extremely small, and that can be flexibly connected as devices on a silicon (Si) wafer. The waveguides can be bent with extremely small curvatures of less than a few micrometers of bending radius because the large difference of refractive indices between the Si-core (n = 3.5) and the silica cladding material (n = 1.5) strongly confines the optical power in the waveguide core. Therefore, these waveguides are promising for flexible optical interconnections on Si chips as well as for constructing many extremely small optical devices. We used Si-nanowire waveguides to fabricate optical directional couplers and demonstrated their fundamental characteristics. Their coupling-length was extremely short, several micrometers, because of strong optical coupling between the waveguide cores. Therefore, we could construct ultra compact power combiners/dividers. We have also demonstrated wavelength demultiplexing functions for these devices with a long coupled waveguide. Optical outputs from a device with a 100-μm long coupled waveguide changed reciprocally with 20-nm wavelength spacing between the parallel and cross ports. Ultra small optical add-drop multiplexers (OADMs) with Bragg grating reflectors made of the Si-nanowire waveguides have been also demonstrated. The dropping wavelength bandwidth of the OADMs was less than 0.7 nm, and these dropping wavelengths could be precisely designed by adjusting the grating period, and this indicated the possibility of applying these devices in dense WDM systems. Using the Si-nanowire waveguide, we have also demonstrated nonlinear-optic effects such as the spectral broadening of optical short pulses due to self-phase modulation and nonlinear transmittance based on two-photon absorption. At a 12 W input power level, we observed a 1.5-π nonlinear phase shift as well as strong saturation of optical output power from a 4-mm Si-nanowire waveguide sample, and that indicates the possibility of constructing integrated nonlinear-optic wavelength conversion devices or optical limiters with Si-nanowire waveguides.

Showing 5 of 8 publications

Conference Committee Involvement (10)

Nano-optoelectronics and Micro/Nano-photonics X

13 October 2024 | Nantong, Jiangsu, China

Nanophotonics and Micro/Nano Optics IX

14 October 2023 | Beijing, China

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

5 December 2022 | Online Only, China

Nanophotonics and Micro/Nano Optics VII

11 October 2021 | Nantong, JS, China

Nanophotonics and Micro/Nano Optics VI

12 October 2020 | Online Only, China

Showing 5 of 10 Conference Committees

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