Low-threshold lasing behavior assisted by the asymmetric grating profile in the guided-mode resonance structure

被引:1
|
作者
Zhang, Xin [1 ]
Xu, Shuozhe [1 ]
Wang, Kangni [1 ]
Qian, Linyong [1 ]
机构
[1] Jiangsu Normal Univ, Sch Phys & Elect Engn, Xuzhou 221116, Peoples R China
基金
中国国家自然科学基金;
关键词
Nanolaser; Guided -mode resonance; Quasi -bound states in the continuum; Symmetry breaking; QUASI-BOUND STATES; CONTINUUM;
D O I
10.1016/j.optmat.2024.115688
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a nanoscale laser based on an asymmetric guided-mode resonance (AGMR) structure. The AGMR creates hybrid resonant modes, which consist of the newly generated quasi-bound states in the continuum (quasiBICs) and the intrinsic GMR mode. By modifying the structural parameters, the GMR and quasi-BICs modes can be matched with the pump and emission wavelengths of the gain medium, respectively. Therefore, high-intensity near fields of the GMR as the resonant optical pumping mode and high quality (Q) factor of the quasi-BICs as the resonant-emitting mode jointly contribute to the low-threshold lasing behavior. The finite-difference timedomain method is used to analyze the lasing characteristics, and a threshold of 14.2 mu J/cm2 is obtained, which is approximately ten times lower than that of a single-coupled mode laser. By adjusting the asymmetry parameters and fill factor of the grating, the threshold can be further reduced to 8.9 mu J/cm2. Additionally, we have also studied the feasibility of the AGMR structure by adjusting the simulation boundary conditions from periodic to perfectly matched layer to simulate a finite-sized structure. The findings provide a new way to excite hybrid modes, opening up possibilities for applications that demand highly confined fields and high Q-factors.
引用
收藏
页数:9
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