中国光学2021，Vol.14Issue(6)：1327-1340,14.DOI:10.37188/CO.2021-0075
双波长窄带宽介质超材料吸收器
Dual-wavelength narrow-bandwidth dielectric metamaterial absorber
摘要
Abstract
In order to reduce the manufacturing cost of the narrow-bandwidth Metamaterial Absorber (MA) and broaden its application field, a dual-wavelength dielectric narrow-bandwidth MA, composed of Au sub-strate, SiO2 dielectric layer and Si dielectric asymmetric grating, is designed based on the finite-difference time-domain method using dielectric materials. It is found by simulation that the proposed narrow-band-width MA has ultra-high absorption efficiency at λ1 = 1.20852 μm and λ2 = 1.23821 μm, and the FWHM is only 0.735 nm and 0.077 nm, respectively. The main principle that MA achieves the narrow-bandwidth ab-sorption at λ1 is mainly due to the formation of Fabry-Pérot (FP) cavity resonance in the SiO2 layer, while the narrow-bandwidth absorption of MA at λ2 is mainly due to the guided mode resonance effect of the incident light in the asymmetric grating. The theoretical calculations show that the absorption characteristics can be affected more significantly by changing the structural parameters of the MA.关键词
超材料吸收器/双波长/窄带宽/法布里-珀罗腔共振/导模共振Key words
metamaterial absorber/dual-wavelength/narrow-bandwidth/Fabry-Pérot cavity resonance/guided mode resonance分类
信息技术与安全科学引用本文复制引用
方晓敏,江孝伟,武华..双波长窄带宽介质超材料吸收器[J].中国光学,2021,14(6):1327-1340,14.基金项目
国家自然科学基金(No.61575008,No.61650404)、江西省自然科学基金(No.20171BAB202037)、江西省教育厅科技项目(No.GJJ170819)、衢州市科技计划项目(No.2019K20)Supported by National Natural Science Foundation of China(No.61575008,No.61650404),Jiangxi Natural Science Foundation(No.20171BAB202037),Technology Project of Jiangxi Provincial Education Department(No.GJJ170819),Quzhou Science and Technology Project(No.2019K20) （No.61575008,No.61650404）
