CAO Shuangshuang,FAN Xinye,FANG Wenjing,CHEN Huawei,BAI Chenglin,TONG Cunzhu.A high-performance multi-wavelength optical switch based on multiple Fano resonances in an all-dielectric metastructure[J].Optoelectronics Letters,2024,(4):193-199 A high-performance multi-wavelength optical switch based on multiple Fano resonances in an all-dielectric metastructure Author Name Affiliation CAO Shuangshuang  School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252000, China  FAN Xinye  School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252000, China Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng 252000, China Liaocheng Key Laboratory of Industrial-Internet Research and Application, Liaocheng 252000, China Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China  FANG Wenjing  School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252000, China Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng 252000, China Liaocheng Key Laboratory of Industrial-Internet Research and Application, Liaocheng 252000, China  CHEN Huawei  School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252000, China  BAI Chenglin  School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252000, China Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng 252000, China Liaocheng Key Laboratory of Industrial-Internet Research and Application, Liaocheng 252000, China  TONG Cunzhu  State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China  Abstract:       The multi-wavelength optical switch based on an all-dielectric metastructure consisting of four asymmetric semi-circular rings was designed and analyzed in this paper. Four Fano resonance modes, which can be explained by bound states in the continuum (BIC) theory, are excited in our structure with a maximum Q-factor of about 2 450 and a modulation depth close to 100%. By changing the polarization direction of the incident light, the transmission amplitude of Fano resonances can get effectively modulated. Based on this tuning property, the metastructure can achieve a multi-wavelength optical switch in the near-infrared region (900—980 nm) and the maximum extinction ratio can reach 38.3 dB. In addition, the results indicate that the Fano resonances are sensitive to the changes in the refractive index. The sensitivity (S) and the figure of merit (FOM) are 197 nm/RIU and 492 RIU-1. The proposed metastructure has promising potential in applications such as optical switches, sensors, modulators and lasers. Hits: 0 Download times: 0 View Full Text    Download reader