Affiliation:
1. Liaocheng University
2. Chinese Academy of Sciences
3. Shandong Provincial Key Laboratory of Optical Communication Science and Technology
4. Liaocheng Key Laboratory of Industrial-Internet Research and Application
5. KL Deemed to be University
Abstract
Fano resonance with high Q-factor is considered to play an important role in the field of refractive index sensing. In this paper, we theoretically and experimentally investigate a refractive index sensor with high performance, realizing a new approach to excite multiple Fano resonances of high Q-factor by introducing an asymmetric parameter to generate a quasi-bound state in the continuum (BIC). Combined with the electromagnetic properties, the formation mechanism of Fano resonances in multiple different excitation modes is analyzed and the resonant modes of the three resonant peaks are analyzed as toroidal dipole (TD), magnetic quadrupole (MQ), and magnetic dipole (MD), respectively. The simulation results show that the proposed metastructure has excellent sensing properties with a Q-factor of 3668, sensitivity of 350 nm/RIU, and figure of merit (FOM) of 1000. Furthermore, the metastructure has been fabricated and investigated experimentally, and the result shows that its maximum Q-factor, sensitivity and FOM can reach 634, 233 nm/RIU and 115, respectively. The proposed metastructure is believed to further contribute to the development of biosensors, nonlinear optics, and lasers.
Funder
Liaocheng University
The Cultivation Plan for Young Scholars in Universities of Shandong Province
The Natural Foundation of Shandong Province
The Open Fund of the Key State Laboratory
Double-Hundred Talent Plan of Shandong Province
Subject
Atomic and Molecular Physics, and Optics,Biotechnology
Cited by
12 articles.
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