Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz

Bian Wu, Hatice M. Tuncer, Majid Naeem, Bin Yang, Matthew T. Cole, William I. Milne, Yang Hao

Research output: Contribution to journalArticlepeer-review

125 Citations (Scopus)

Abstract

The development of transparent radio-frequency electronics has been limited, until recently, by the lack of suitable materials. Naturally thin and transparent graphene may lead to disruptive innovations in such applications. Here, we realize optically transparent broadband absorbers operating in the millimetre wave regime achieved by stacking graphene bearing quartz substrates on a ground plate. Broadband absorption is a result of mutually coupled Fabry-Perot resonators represented by each graphene-quartz substrate. An analytical model has been developed to predict the absorption performance and the angular dependence of the absorber. Using a repeated transfer-and-etch process, multilayer graphene was processed to control its surface resistivity. Millimetre wave reflectometer measurements of the stacked graphene-quartz absorbers demonstrated excellent broadband absorption of 90% with a 28% fractional bandwidth from 125-165â€...GHz. Our data suggests that the absorbers' operation can also be extended to microwave and low-terahertz bands with negligible loss in performance.

Original languageEnglish
Article number4130
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 19 Feb 2014

ASJC Scopus subject areas

  • General

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