Ultra-Thin metasurface absorbers for spectro-polarimetric radiation detectors: In-depth electromagnetic analysis and practical design for subterahertz band

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Abstract

We present the results of extensive theoretical and experimental investigations of high-performance ultra-Thin metasurface-based radiation absorbers designed for narrow-band operation at subterahertz (subTHz) frequencies and intended for integration with spectro-polarimetric sensors of a thermal type. Implemented in a three-layered configuration with a capacitive frequency selective surface (FSS) backed by a grounded dielectric slab, the absorbers are analyzed in terms of minimizing their thickness-To-wavelength (d / λ) ratio and absorption bandwidth, while maximizing the FSS unit cells subwavelengthness and free dispersion range for absorption spectra. A choice of optimal material parameters and a role of near-field 'FSS-ground plane' coupling are discussed and an optimal FSS pattern for a 'spectrometric' absorber is deduced. Supplemented with experimental measurements in the range of 0.1-1 THz demonstrating feasibility of attaining d / λ∼1/200 at the bandwidth of several percent, original cost-effective metasurface-Absorber-based schemes for uncooled thermal subTHz sensing with spectrometric, polarimetric, and imaging capabilities are also considered.

Original languageEnglish
Title of host publication2017 11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages193-195
Number of pages3
ISBN (Electronic)9781538637685
DOIs
Publication statusPublished - 14 Nov 2017
Event11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017 - Marseille, France
Duration: 28 Aug 20172 Sep 2017

Conference

Conference11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
CountryFrance
CityMarseille
Period28.08.201702.09.2017

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