Ms. Jinxian Qu Profile

Jinxian Qu

at Institute of Semiconductors CAS

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Proceedings Article | 5 November 2020 Paper

Low-contrast grating induced high-Q modes of laser cavity

Ce Fan, Yufei Wang, Jinxian Qu, Ting Fu, Wanhua Zheng

Proceedings Volume 11564, 115640I (2020) https://doi.org/10.1117/12.2580872

KEYWORDS: Diffraction gratings, Vertical cavity surface emitting lasers, Photonic crystals, Optical design, Laser resonators

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Bound states in the continuum (BICs) remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. These modes can be almost perfectly localized in the structure, making lasers working at BIC or quasi-BIC have an ultrahigh quality factor (Q) and hence low threshold. Lowcontrast gratings (LCGs) have better mode selectivity than high-contrast gratings and promise higher single-mode output power for LCG-based vertical-cavity surface-emitting lasers. A quasi-BIC (i.e. supercavity mode) with a Q factor of 9.2 × 10⁵ is obtained in the LCG, and a simplified three-layer slot laser with a Q factor of 9.66 × 10⁶ is constructed. Further, a law of using the period of a grating to control resonant wavelength and using etched depth and width to control Q factor can be used for designing a high-Q structure at a specified wavelength. The calculated Q factor is optimized systematically by changing various parameters, and the highest Q factor obtained reaches 2.81 × 10⁷ . The results of all these analyses are instructive to the design of grating-based low threshold electrically injected surface-emitting lasers or other high-Q devices.

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