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

• DOI: 10.1038/srep04130
• Publication Date: 2014-02-19T10:02:10Z
• Authors: Bian Wu; Hatice M. Tuncer; Majid Naeem; Bin Yang; Matthew T. Cole; William I. Milne; Yang Hao
• Keywords: Extremely high frequency

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