Wide-angle wideband polarization-insensitive perfect absorber based on uniaxial anisotropic metasurfaces

Shi Kang Tseng, Hui Hsin Hsiao, Yih Peng Chiou

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A wide-angle, wideband, and polarization-insensitive metamaterial (MM) absorber was studied based on the theoretical concept of uniaxial perfect matching layer (UPML) in the terahertz range. The MM absorber was designed as a multi-layered anisotropic array structure consisting of a conductive VIA, a bi-layered slot-FSS, and a split-ring resonator (SRR) separated by porous silica spacers. Each component is optimized to approach the required macroscopic uniaxial property for satisfying the reflection-less boundary condition. The SRRs and VIAs were found to play an important role in maintaining large absorption when the angle of oblique incidence increases under transverse electric (TE) and transverse magnetic (TM) polarization, respectively. The absorption achieves 90% in the frequency regime of 0.9 to 10.5 THz, corresponding to a bandwidth of 168% to the central frequency, and retains such high performance up to 60° oblique incidence for both TE and TM waves.

Original languageEnglish
Pages (from-to)1193-1203
Number of pages11
JournalOptical Materials Express
Volume10
Issue number5
DOIs
Publication statusPublished - 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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