Enhanced Absorptivity in Ultra-thin Graphene Tunable Selective THz Absorber

Omnia Samy, Taiichi Otsuji, Amine El Moutaouakil

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Selective THz absorbers have a wide range of applications in monochromatic detectors, filters, and sensors, especially with the recent rise in THz technology. Metamaterial absorbers could achieve high absorptivity but have complex structures. Previous selective THz absorbers achieved good absorptivity but in a very limited THz range. In this work, we present a THz selective absorber with at least 95 % and near unity absorption across the whole THz range. When including gold below the substrate with a thickness of 5 nm a rise of 5% in absorptivity is noticed, to increase the least absorptivity from 90% to 95% and near unity at most frequencies. The design is based on simple nanoribbons of graphene, MoS2, and phosphorene monolayers laid over SiO2 and gold. The tunability of the absorption frequency is achieved through varying the gate voltage.

Original languageEnglish
Title of host publication2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024
PublisherIEEE Computer Society
ISBN (Electronic)9798350370324
DOIs
Publication statusPublished - 2024
Event49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024 - Perth, Australia
Duration: Sept 1 2024Sept 6 2024

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Conference

Conference49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024
Country/TerritoryAustralia
CityPerth
Period9/1/249/6/24

Keywords

  • graphene/MoS nanoribbons
  • phosphorene nanoribbons
  • Selective THz absorbers

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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