Dr. Jipeng Xu Profile

Dr. Jipeng Xu

at National Univ of Defense Technology

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Proceedings Article | 15 December 2022 Paper

Low threshold optomechanically induced bistability based on suspended metasurface

You Sang, Jipeng Xu

Proceedings Volume 12478, 1247807 (2022) https://doi.org/10.1117/12.2646542

KEYWORDS: Bistability, Nonlinear optics

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We theoretically propose an optomechanical system based on suspended metasurface to achieve low threshold optical bistability. By integrating the silicon nitride (Si3N4) membrane with metasurface, it can achieve a near-unity reflectivity around 1550 nm, when it forms an optomechanical cavity with a high-reflectivity fixed mirror, its 2 mm 2 mm size and 100 nm thickness enable it to respond sensitively to radiation pressures on the order of 100 milliwatts.Benefit from the excellent optical and mechanical properties of the metasurface, the optomechanical system performs strong optomechanically induced nonlinearity, and exhibits optical bistability at intensity of aboot 1.5 W/cm^-2.

Proceedings Article | 24 November 2021 Paper

Inverse nanotapers and lensed fibers for highly efficient coupling

Ning Liu, Jipeng Xu, Jie Luo

Proceedings Volume 12066, 1206609 (2021) https://doi.org/10.1117/12.2602115

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Because it is not possible to integrate the light source on the silicon-based photonic chips, it is necessary to study the efficient coupling method to coupling the light from the fiber into the chip. In order to ensure the high coupling efficiency, the edge coupling method is adopted in this paper. The simulation is carried out in the COMSOL software. The incident light is set as a Gaussian beam with a waist diameter of 2.5 μm and a wavelength of 1550 nm to simulate the light emitted from the lensed fiber. The incident region of the waveguide adopts an inverse-nanotaper design, that is along the direction of light propagation, the width and height of the waveguide in the taper region gradually increase and keep constants in the bus waveguide region. In this paper, the specific size of the designed inverse-nanotaper coupler is given, and the coupling efficiency of the edge couplers under different conditions is analyzed, which lays a certain foundation for on-chip integration of related devices.

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