期刊
NATURE NANOTECHNOLOGY
卷 7, 期 7, 页码 472-478出版社
NATURE RESEARCH
DOI: 10.1038/NNANO.2012.88
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资金
- IARPA
- ONR MURI programme
- NSF [DMR-0804976, DMR-1105224]
- NSF MRSEC [DMR-0520471]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1105224] Funding Source: National Science Foundation
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.
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