Journal
IET MICROWAVES ANTENNAS & PROPAGATION
Volume 9, Issue 4, Pages 307-312Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-map.2014.0152
Keywords
millimetre wave materials; electromagnetic wave absorption; absorbing media; equivalent circuits; tuning; graphene; broadband terahertz absorbers; tunable terahertz absorbers; graphene metasurface based terahertz absorbers; equivalent circuit model; metal-backed dielectric layer; full-wave electromagnetic simulation; C
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This study presents an effective method to model, analyse and design graphene metasurface-based terahertz (THz) absorbers using equivalent circuit model approach. Broadband and tunable absorbers consisting of graphene metasurface and metal-backed dielectric layer have been designed based on the formulas derived from this approach and verified by full-wave electromagnetic simulation. By properly constructing the graphene metasurface, broadband absorption over 70% fraction bandwidth has been achieved, showing that graphene can provide a wideband absorption in the low THz spectrum. Furthermore, tunability of the graphene metasurface has also been investigated. It is demonstrated that the absorption peak frequencies can be tuned while maintaining the peak absorption unchanged, which is highly desirable for THz sensing applications.
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