Admittance analysis of broadband omnidirectional near-perfect absorber in epsilon-near-zero mode

Wei Bo Liao, Cheng Chung Lee, Ya Chen Chang, Wen Hao Cho, Hung Pin Chen, Chien Cheng Kuo

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3 Scopus citations

Abstract

In this paper, we propose a broadband omnidirectional near-perfect absorber that transforms light energy into heat. In contrast to previous research on structural metamaterials, this study focuses on light absorption in the epsilon-near-zero (ENZ) layers without any structural patterns. Chromium (Cr) thin films were applied as ENZ layers. Using the admittance method, we found the proper thicknesses of SiO2 layers to match the incident medium and achieve perfect absorption. Also, the absorber is angular insensitive up to 60. The temperature of the absorber increases from room temperature to 42C, which is 4C higher than the uncoated substrate at 38C, after exposure to sunlight for 20 min.

Original languageEnglish
Pages (from-to)10138-10142
Number of pages5
JournalApplied Optics
Volume59
Issue number32
DOIs
StatePublished - 10 Nov 2020

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