Polarization-independent and high-efficiency broadband optical absorber in visible light based on nanostructured germanium arrays

Zhao, Jiancun and Yu, Xiaochang and Yang, Xiaoming and Tee, Clarence Augustine Teck Huo and Yuan, Weizheng and Yu, Yiting (2019) Polarization-independent and high-efficiency broadband optical absorber in visible light based on nanostructured germanium arrays. Optics Letters, 44 (4). pp. 963-966. ISSN 0146-9592, DOI https://doi.org/10.1364/OL.44.000963.

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Official URL: https://doi.org/10.1364/OL.44.000963


A broadband optical absorber based on the nanostructured germanium (Ge) film composed of single-sized circular nanodisk–nanohole arrays is proposed, which demonstrates high efficiency, strong polarization independence, and large viewing angle. Due to the electric and magnetic resonance absorption modes excited by the nanostructure arrays in highly lossy Ge film, the absorber obtains a high absorptivity, reaching above 90% over the full visible wavelength, and it can be maintained well at a large viewing angle over 50°. Based on the geometrical symmetry, the absorber is proved to be polarization independent. Moreover, the simple single-sized nanostructure within a certain size tolerance decreases the design and fabrication complexity. The structural configuration with a slight Ge sidewall formed in the nanofabrication process could enhance the overall light absorption. These results indicate that the proposed broadband absorber has great potential in various applications such as anti-reflective coating and perfect cloaking.

Item Type: Article
Funders: National Natural Science Foundation of China (NSFC) (51622509), Fundamental Research Funds for the Central Universities (3102017jg02007), The 111 Project (B13044), The Strategic Initiative Project, The Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University (ZZ2018009), The Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX201830)
Uncontrolled Keywords: Anti reflective coatings; Geometrical symmetries; Magnetic resonance absorption; Nanofabrication process; Nanostructure arrays; Polarization independence; Polarization independent; Structural configurations
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 31 Oct 2019 08:47
Last Modified: 01 Nov 2019 01:19
URI: http://eprints.um.edu.my/id/eprint/22897

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