Tunable lasing direction in one-dimensional suspended high-contrast grating using bound states in the continuum

IF 20.6 1区物理与天体物理 Q1 OPTICS

Advanced Photonics Pub Date : 2022-11-01 DOI:10.1117/1.AP.4.6.066004

Zhen‐Ting Huang, Chiao-Yun Chang, Kuo‐Ping Chen, T. Lu

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引用次数: 3

Abstract

Abstract. We realized off-Γ lasing using the Friedrich–Wintgen bound state in the continuum (FW-BIC) in a one-dimensional suspended high-contrast grating (HCG). A clear anticrossing was observed in the band diagram of the HCG corresponding to the coupling between the specific different orders of Bloch modes, and the FW-BIC with a high quality factor and large confinement factor was observed near the anticrossing point. Owing to these outstanding characteristics, the FW-BIC can serve as a robust and extraordinary cavity mode for realizing low-threshold laser operation and for achieving angle-steering laser beams. The conditions of the FW-BIC can be modulated by tuning the geometry related to the coupling modes in the anticrossing, resulting in a tunable lasing direction observed in the measurement. Furthermore, through appropriate design, the emission angle can be controlled precisely within a wide tunable range. Therefore, FW-BICs can be used to realize high-resolution directional lasing within a wide range of emission angles; they can also be applied in three-dimensional sensing for lidar applications.

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一维悬浮高对比度光栅中利用连续介质束缚态的可调谐激光方向

摘要我们利用一维悬浮高对比度光栅(HCG)中的Friedrich-Wintgen束缚态(FW-BIC)实现了-Γ激光。在特定不同阶Bloch模式耦合对应的HCG带图中观察到明显的反交叉，在反交叉点附近观察到质量因子高、约束因子大的FW-BIC。由于这些突出的特点，FW-BIC可以作为实现低阈值激光操作和实现角度转向激光束的鲁棒和非凡的腔模式。通过调整与防交叉耦合模式相关的几何形状，可以调制FW-BIC的条件，从而在测量中观察到可调谐的激光方向。此外，通过适当的设计，可以将发射角精确地控制在较宽的可调范围内。因此，FW-BICs可以在大发射角范围内实现高分辨率定向激光;它们还可以应用于激光雷达应用的三维传感。

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来源期刊

Advanced Photonics OPTICS-

CiteScore

22.70

自引率

1.20%

发文量

审稿时长

18 weeks

期刊介绍： Advanced Photonics is a highly selective, open-access, international journal that publishes innovative research in all areas of optics and photonics, including fundamental and applied research. The journal publishes top-quality original papers, letters, and review articles, reflecting significant advances and breakthroughs in theoretical and experimental research and novel applications with considerable potential. The journal seeks high-quality, high-impact articles across the entire spectrum of optics, photonics, and related fields with specific emphasis on the following acceptance criteria: -New concepts in terms of fundamental research with great impact and significance -State-of-the-art technologies in terms of novel methods for important applications -Reviews of recent major advances and discoveries and state-of-the-art benchmarking. The journal also publishes news and commentaries highlighting scientific and technological discoveries, breakthroughs, and achievements in optics, photonics, and related fields.