A Polarization-Insensitive Broadband Metamaterial Absorber at the Optical Regime

We present a polarization-insensitive broadband absorber which has a feature of metal-insulator-metal structures. The top metal layer consists of four-fan-rings-shaped gold. Simulations show that the absorber exhibits an absorption of nearly unity at the wavelength of 386.1 nm and a relative absorpt...

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Published inChinese physics letters Vol. 32; no. 9; pp. 54 - 57
Main Author 史俊贤 张文超 许婉 朱青 江夏 李冬冬 闫长春 张道华
Format Journal Article
LanguageEnglish
Published 01.09.2015
Subjects
Absorption
Bandwidth
Broadband
Incident waves
Polarization
Simulation
Unity
Wavelengths
偏振不敏感
光学波段
光波长
吸收材料
吸波体
宽带吸收
金属-绝缘体
金属结构
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/9/094204

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Summary:We present a polarization-insensitive broadband absorber which has a feature of metal-insulator-metal structures. The top metal layer consists of four-fan-rings-shaped gold. Simulations show that the absorber exhibits an absorption of nearly unity at the wavelength of 386.1 nm and a relative absorption bandwidth of 0.548, which refers to the ratio of the full absorption bandwidth over an absorption of 0.9 to the central wavelength. Meanwhile, the absorption is nearly independent of the polarized direction of the incident wave. This absorption bandwidth with insensitive polarization is widely reported to date for such metal-insulator-metal structures. Such a structure offers a way of realization of a polarization-insensitive broadband absorber ranging in ultraviolet-to-visible wavelengths.
Bibliography:We present a polarization-insensitive broadband absorber which has a feature of metal-insulator-metal structures. The top metal layer consists of four-fan-rings-shaped gold. Simulations show that the absorber exhibits an absorption of nearly unity at the wavelength of 386.1 nm and a relative absorption bandwidth of 0.548, which refers to the ratio of the full absorption bandwidth over an absorption of 0.9 to the central wavelength. Meanwhile, the absorption is nearly independent of the polarized direction of the incident wave. This absorption bandwidth with insensitive polarization is widely reported to date for such metal-insulator-metal structures. Such a structure offers a way of realization of a polarization-insensitive broadband absorber ranging in ultraviolet-to-visible wavelengths.
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SHI Jun-Xian, ZHANG Wen-Chao, XU Wan, ZHU Qing, JIANG Xia, LI Dong-Dong, YAN Chang-Chun, ZHANG Dao-gua（ 1 Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering Jiangsu Normal University, Xuzhou 221116 2 School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/9/094204