Abstract

In recent years, the investigations of lasers based on group IV material have been limited by the low quality (Q) factor of the resonant modes. With the improvement of the optical bound states in the continuum (BICs) in various dielectric systems, we propose a novel design that takes advantages of both the direct bandgap dielectric material GeSn and the BIC phenomenon. In addition to the demonstration of the unprecedented high-Q factors (i.e., ${\sim}{{10}^{10}}$) that improve the emission process, the vertical symmetry broken structure can emit light at the wavelength of 1870 nm with higher luminous intensity (i.e., ${\sim}{24}$). The modulation effect of the material and geometric parameters on the Q value and the luminous intensity of the structure are also demonstrated. Our investigations provide useful guidelines for potential applications such as on-chip light sources in group IV photonics and optical communications.

© 2020 Optical Society of America

Ultra-high-Q resonances in terahertz all-silicon metasurfaces based on bound states in the continuum

Pengfei Wang, Fengyan He, Jianjun Liu, Fangzhou Shu, Bin Fang, Tingting Lang, Xufeng Jing, and Zhi Hong
Photon. Res. 10(12) 2743-2750 (2022)

Terahertz investigation of bound states in the continuum of metallic metasurfaces

Xiaoguang Zhao, Chunxu Chen, Kelson Kaj, Ian Hammock, Yuwei Huang, Richard D. Averitt, and Xin Zhang
Optica 7(11) 1548-1554 (2020)

Ultra-high Q resonances based on zero group-velocity modes accompanied by bound states in the continuum in 2D photonic crystal slabs

Jun Zhang, Beibei Dong, Yajing Wang, Mengting Li, Yufang Liu, Hai Lu, and Kun Yu
Opt. Express 32(9) 15065-15077 (2024)

Ultra-high-Q and ultra-sensitive refractive index sensing in low refractive index dielectric gratings based on bound states in the continuum

Ze-Zhou Fang, Han-Lei Xu, Jin-Yue Su, Jin-Yun Zhou, and Zi-Ming Meng
J. Opt. Soc. Am. B 41(1) 98-104 (2024)

Terahertz high-Q quasi-bound states in the continuum in laser-fabricated metallic double-slit arrays

Dejun Liu, Xi Yu, Feng Wu, Shuyuan Xiao, Fumihiro Itoigawa, and Shingo Ono
Opt. Express 29(16) 24779-24791 (2021)