Ultra-small-size microcavity with high quality factor utilizing bound state in the continuum

Yi Zuo; Xinyi Zhou; Zihao Chen; Feifan Wang; Chao Peng

doi:10.1117/12.2691303

16 October 2023 Ultra-small-size microcavity with high quality factor utilizing bound state in the continuum

Yi Zuo, Xinyi Zhou, Zihao Chen, Feifan Wang, Chao Peng

Proceedings Volume 12792, Eighteenth National Conference on Laser Technology and Optoelectronics; 127921I (2023) https://doi.org/10.1117/12.2691303
Event: Eighteenth National Conference on Laser Technology and Optoelectronics, 2023, Shanghai, China

Abstract

The bound state in the continuum (BIC) is widely used in optical field confinement because of its potential in radiation suppression, providing an energy confinement method different from traditional microcavities. However, the size compression of BIC cavities still remains challenging. In this paper, we report an ultra-small size, high-Q BIC microcavity on silicon on insulator (SOI) platfom. We used the integer topological charges carried by the BICs to suppress the vertical radiation loss, while photonic crystal hetero-structures were utilized to reduce the transverse energy leakage. We designed and fabricated photonic crystal microcavity with optical confinement region as tiny as 5×5 period. The measured Q is greater than 170 thousand with the peak wavelength at 1550.39 nm. This work shows the potential of BIC microcavities in size compression. The study has positive effects on integrated optics, information optics, biooptics, topological optics and nonlinear optics.

Citation Download Citation

Yi Zuo, Xinyi Zhou, Zihao Chen, Feifan Wang, and Chao Peng "Ultra-small-size microcavity with high quality factor utilizing bound state in the continuum", Proc. SPIE 12792, Eighteenth National Conference on Laser Technology and Optoelectronics, 127921I (16 October 2023); https://doi.org/10.1117/12.2691303

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