Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Low-threshold Optical Bistability Based on Bound States in the Continuum

  • Kim, Myunghwan (Integrated Optics Laboratory, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology) ;
  • Kim, Sangin (Department of Electric and Computer Engineering, Ajou University) ;
  • Kim, Soeun (Integrated Optics Laboratory, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)
  • Received : 2021.09.29
  • Accepted : 2021.12.07
  • Published : 2022.02.25
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Abstract

Low-threshold optical bistability is essential for practical nonlinear optical applications. Many bistable optical devices based on high-quality-factor resonators have been proposed to reduce the threshold intensity. However, demonstrating high-quality-factor resonance requires complex fabrication techniques. In this work, we numerically demonstrate optical bistability with bound states in the continuum in a simple one-dimensional Si photonic crystal. The designed structure supports bound states in the continuum, producing an ultrahigh quality factor without tough fabrication conditions. The threshold intensity of the designed device is 150 MW/cm2 at the optical communication wavelength. This scheme may lead to a new class of nonlinear photonics.

Keywords

Acknowledgement

National Research Foundation of Korea (NRF 2019R1I1A1A01061983), and the GIST Research Institute (GRI2022).

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