Visible light nearly perfect absorber: an optimum unit cell arrangement for near absolute polarization insensitivity

In this work, we propose an optimum unit cell arrangement to obtain near absolute polarization insensitivity in a metal-insulator-metal (MIM) based ultra-broadband perfect absorber. Our findings prove that upon utilizing this optimum arrangement, the response of the absorber is retained and unchange...

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Published inOptics express Vol. 25; no. 22; pp. 27624 - 27634
Main Authors Ghobadi, Amir, Hajian, Hodjat, Gokbayrak, Murat, Dereshgi, Sina Abedini, Toprak, Ahmet, Butun, Bayram, Ozbay, Ekmel
Format Journal Article
LanguageEnglish
Published United States 30.10.2017
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Summary:In this work, we propose an optimum unit cell arrangement to obtain near absolute polarization insensitivity in a metal-insulator-metal (MIM) based ultra-broadband perfect absorber. Our findings prove that upon utilizing this optimum arrangement, the response of the absorber is retained and unchanged over all arbitrary incidence light polarizations, regardless of the shape of the top metal patch. First, the impact of the geometry of the top nanopatch resonators on the absorption bandwidth of the overall structure is explored. Then, the response of the MIM design for different incidence polarizations and angles is scrutinized. Finally, the proposed design is fabricated and characterized.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.25.027624