Graphene-supported tunable THz absorber based on guided mode resonances

Jun Wu

doi:10.1117/1.JNP.12.046001

8 October 2018 Graphene-supported tunable THz absorber based on guided mode resonances

Jun Wu

Author Affiliations +

Journal of Nanophotonics, Vol. 12, Issue 4, 046001 (October 2018). https://doi.org/10.1117/1.JNP.12.046001

Abstract

A graphene-based tunable absorber consisting of a graphene monolayer on a dielectric grating and dielectric gap layer backed with a substrate is proposed and investigated. The absorber exhibits higher than 80% absorption at resonance, which is attributed to the guided mode resonances (GMRs) of a simple one-dimensional dielectric grating. Furthermore, the ultranarrow spectrum and antenna-like response make it able to be used as a thermal emitter with high directionality. The physical mechanism of such perfect absorption performance is disclosed by the illustrated electric field distributions. Lastly, the influence of Fermi level and relaxation time on the absorption spectra is investigated, which will benefit the design of graphene-based devices. The results indicate that it will promote the development of graphene-based tunable devices when combining graphene with general GMRs effect.

Citation Download Citation

Jun Wu "Graphene-supported tunable THz absorber based on guided mode resonances," Journal of Nanophotonics 12(4), 046001 (8 October 2018). https://doi.org/10.1117/1.JNP.12.046001

Received: 26 June 2018; Accepted: 18 September 2018; Published: 8 October 2018

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KEYWORDS

Absorption

Graphene

Dielectrics

Terahertz radiation

Dielectric polarization

Refractive index

Thermography

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