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Open AccessArticle

A Designed Broadband Absorber Based on ENZ Mode Incorporating Plasmonic Metasurfaces

1
Division of Electronics Engineering, Chonbuk National University, Jeonju 54896, Korea
2
Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
3
Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
*
Authors to whom correspondence should be addressed.
Micromachines 2019, 10(10), 673; https://doi.org/10.3390/mi10100673
Received: 6 August 2019 / Revised: 26 September 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Nanostructured Light-Emitters)
In this paper, we present a numerical study of a metamaterial absorber that provides polarization-insensitive absorption over a broad bandwidth of operation over the mid-infrared region. The absorber consists of a periodically patterned metal-dielectric-metal structure integrated with an epsilon-near-zero (ENZ) nanolayer into the insulating dielectric gap region. Such an anomalous broadband absorber is achieved thanks to a couple of resonant modes including plasmon and ENZ modes that are excited under mid-IR light illumination. By adding a 0.06-μm-thick ENZ layer between the patterned gold rectangular grating and the SiO2 dielectric layer, the absorber captures >95% light over a 1.5 µm bandwidth centered at a near-8-μm wavelength over a wide range of oblique incidence under transverse-magnetic and -electric polarizations. The designed ENZ-based wideband absorber has potential for many practical applications, including sensing, imaging and solar energy harvesting over a wide frequency regime.
Keywords: epsilon-near-zero; wideband absorber; plasmon mode; Brewster mode epsilon-near-zero; wideband absorber; plasmon mode; Brewster mode
MDPI and ACS Style

Dang, P.T.; Le, K.Q.; Lee, J.-H.; Nguyen, T.K. A Designed Broadband Absorber Based on ENZ Mode Incorporating Plasmonic Metasurfaces. Micromachines 2019, 10, 673.

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