Quasi-BIC laser enabled by high-contrast grating resonator for gas detection
Zhang Haoran,
Wang Tao,
Tian Jingyi,
Sun Jiacheng,
Li Shaoxian,
De Leon Israel,
Zaccaria Remo Proietti,
Peng Liang,
Gao Fei,
Lin Xiao,
Chen Hongsheng,
Wang Gaofeng
Affiliations
Zhang Haoran
Engineering Research Center of Smart Microsensors and Microsystems of MOE; and School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China
Wang Tao
Engineering Research Center of Smart Microsensors and Microsystems of MOE; and School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China
Tian Jingyi
Centre for Disruptive Photonic Technologies, TPI, SPMS, Nanyang Technological University, Nanyang, 637371, Singapore
Sun Jiacheng
Engineering Research Center of Smart Microsensors and Microsystems of MOE; and School of Zhuoyue Honors, Hangzhou Dianzi University, Hangzhou, 310018, China
Li Shaoxian
Engineering Research Center of Smart Microsensors and Microsystems of MOE; and School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China
De Leon Israel
School of Engineering and Sciences, Tecnológico de Monterrey, Monterrey, Nuevo León64849, Mexico
Zaccaria Remo Proietti
Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences; Italian Institute of Technology, via Morego 30, 16163Genova, Italy
Peng Liang
School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou, 310015, China
Gao Fei
Interdisciplinary Center for Quantum Information, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou310027, China
Lin Xiao
Interdisciplinary Center for Quantum Information, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou310027, China
Chen Hongsheng
Interdisciplinary Center for Quantum Information, College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou310027, China
Wang Gaofeng
Engineering Research Center of Smart Microsensors and Microsystems of MOE; and School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China
In this work, we propose and numerically investigate a two-dimensional microlaser based on the concept of bound states in the continuum (BIC). The device consists of a thin gain layer (Rhodamine 6G dye-doped silica) sandwiched between two high-contrast-grating layers. The structure supports various BIC modes upon a proper choice of topological parameters; in particular it supports a high-Q quasi-BIC mode when partially breaking a bound state in the continuum at Γ point. The optically-pumped gain medium provides sufficient optical gain to compensate the quasi-BIC mode losses, enabling lasing with ultra-low pump threshold (fluence of 17 μJ/cm2) and very narrow optical linewidth in the visible range. This innovative device displays distinguished sensing performance for gas detection, and the emission wavelength sensitively shifts to the longer wavelength with the changing of environment refractive index (in order of 5 × 10−4). The achieved bulk sensitivity is 221 nm/RIU with a high signal to noise ratio, and a record-high figure of merit reaches to 4420 RIU−1. This ultracompact and low threshold quasi-BIC laser facilitated by the ultra-narrow resonance can serve as formidable candidate for on-chip gas sensor.
