Abstract
Abstract
In this study, a terahertz (THz) composite slab (TCS) based on metal grating and dielectric films is experimentally and numerically investigated in the THz region. By combining a dielectric film, the TCS exhibits different sharp resonances for varied polarization waves. A sharp Fano resonance is excited for transverse magnetic (TM) waves, which originates from the introduced asymmetric factor by dielectric films. The film thickness and refractive index can be used for the Fano resonance tuning. The resonant Q-factor can be improved using thinner and lower refractive index films. For transverse electric (TE) modes, a resonance termed guided modes can also be induced when the dielectric film is thick enough. The effects of film thickness and refractive index on these resonances are analyzed in detail. These results demonstrated that this TCS with high Q-factors or narrow resonances for both TM and TE waves is a promising component for THz filter and sensor applications.
Funder
National Natural Science Foundation of China
Shanghai Pujiang Program
Innovation Program of Shanghai Municipal Education Commission
Guangdong Polytechnic Normal University
Science and Technology Foundation
Science and Technology Commission of Shanghai Municipality
Grants Foundation
Amada Foundation
Hirose Foundation
Ministry of Education, Culture, Sports, Science and Technology of Japan
Natural Science Foundation of Jiangxi Province
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
3 articles.
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