Optically transparent, broadband and omnidirectional microwave absorber based on graphene-SiO₂ metasurfaces

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oe322341974.pdf (3.44 MB)

Links to Files

https://opg.optica.org/oe/abstract.cfm?uri=oe-32-23-41974

Permanent Link

https://doi.org/10.1364/OE.538840
 http://hdl.handle.net/11603/38710

Collections

UMBC Computer Science and Electrical Engineering Department
UMBC Faculty Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0002-7132-0103

Date

2024-11-01

Type of Work

journal articles
Text

Department

Program

Citation of Original Publication

Kwon, Hoyeong, Giuseppe D’Aguanno, and Andrea Alù. “Optically Transparent, Broadband and Omnidirectional Microwave Absorber Based on Graphene-SiO₂ Metasurfaces.” Optics Express 32, no. 23 (November 4, 2024): 41974–83. https://doi.org/10.1364/OE.538840.

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Subjects

Surface waves
Thin films
Effective medium theory
Wave propagation
Deep learning
Absorbers

Abstract

Broadband and omnidirectional absorption of electromagnetic waves is required in various technologies, such as stealth, high quality wireless communications, spacecraft shielding. In this study, we theoretically and numerically study a graphene-based absorber achieving broadband and omnidirectional absorption from 4 GHz to 100 GHz and 0 ∘ to 50 ∘∼70 ∘, with over 90% absorption efficiency. By applying a thin layer of graphene upon a SiO₂ moth-eye structure, we show that electromagnetic waves can be effectively absorbed in the graphene layer and that the structure is optically transparent, ideal for civilian and military applications.