A Designed Broadband Absorber Based on ENZ Mode Incorporating Plasmonic Metasurfaces

Micromachines

TruongKhang Nguyen¹  KhaiQ. Le¹  PhucToan Dang²  Ji-Hoon Lee² 

[1] Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam;Division of Electronics Engineering, Chonbuk National University, Jeonju 54896, Korea;

关键词: epsilon-near-zero;    wideband absorber;    plasmon mode;    brewster mode;   

DOI  :  10.3390/mi10100673

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown