Dual-gated bilayer graphene hot-electron bolometer

Jun Yan, M. H. Kim, J. A. Elle, A. B. Sushkov, G. S. Jenkins, H. M. Milchberg, M. S. Fuhrer, H. D. Drew

Research output: Contribution to journalArticlepeer-review

314 Scopus citations

Abstract

Graphene is an attractive material for use in optical detectors because it absorbs light from mid-infrared to ultraviolet wavelengths with nearly equal strength. Graphene is particularly well suited for bolometers-devices that detect temperature-induced changes in electrical conductivity caused by the absorption of light-because its small electron heat capacity and weak electron-phonon coupling lead to large light-induced changes in electron temperature. Here, we demonstrate a hot-electron bolometer made of bilayer graphene that is dual-gated to create a tunable bandgap and electron- temperature-dependent conductivity. The bolometer exhibits a noise-equivalent power (33 fW Hz-1/2 at 5 K) that is several times lower, and intrinsic speed (>1 GHz at 10 K) three to five orders of magnitude higher than commercial silicon bolometers and superconducting transition-edge sensors at similar temperatures.

Original languageEnglish
Pages (from-to)472-478
Number of pages7
JournalNature Nanotechnology
Volume7
Issue number7
DOIs
StatePublished - Jul 2012

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