Low-threshold lasing behavior based on quasi-bound states in the continuum in a slanted guided-mode resonance nanocavity

Author:

Gu Tiancheng,Xu Shuozhe,Zhang Xin,Wang KangniORCID,Qian LinyongORCID

Abstract

In this study, hybrid resonance modes are obtained when symmetry-breaking is introduced into a guided-mode resonance (GMR) grating, which transforms bound states in the continuum (BICs) into quasi-BICs with a high-quality factor while retaining the intrinsic GMR mode. The structural parameters are modified such that GMR and quasi-BICs resonance occur at the pump and emission wavelengths of the gain medium, respectively. Resonant optical pumping and high-quality nanocavities are utilized simultaneously, and a low-threshold laser is realized. We theoretically demonstrate that the threshold can be reduced to 24.6 µJ/cm2, which is approximately 4 times lower than that of the laser based on GMR alone. The lasing action can be modulated by optimizing the asymmetry parameter and the electric field, and the threshold can be further reduced.

Funder

National Natural Science Foundation of China

The Ph.D. Teacher’s Research Project of Jiangsu Normal University

Postgraduate Research and Practice Innovation Program of Jiangsu Normal University

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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