Fast thermal relaxation in cavity-coupled graphene bolometers with a Johnson noise read-out
Name
1711.02142.pdf
Description
Accepted version
Size
1.01 MB
Format
Adobe PDF
Checksum (MD5)
93bf9277d2748d230c98a88168b73a10
Author(s)
Efetov, Dmitri K
Shiue, Ren-Jye
Gao, Yuanda
Skinner, Brian
Walsh, Evan D
Choi, Hyeongrak
Zheng, Jiabao
Tan, Cheng
Grosso, Gabriele
Peng, Cheng
Date Issued
2018
Journal
Nature Nanotechnology
Publisher
Springer Nature
Version
Author's final manuscript
Abstract
© 2018, The Author(s). High sensitivity, fast response time and strong light absorption are the most important metrics for infrared sensing and imaging. The trade-off between these characteristics remains the primary challenge in bolometry. Graphene with its unique combination of a record small electronic heat capacity and a weak electron–phonon coupling has emerged as a sensitive bolometric medium that allows for high intrinsic bandwidths1–3. Moreover, the material’s light absorption can be enhanced to near unity by integration into photonic structures. Here, we introduce an integrated hot-electron bolometer based on Johnson noise readout of electrons in ultra-clean hexagonal-boron-nitride-encapsulated graphene, which is critically coupled to incident radiation through a photonic nanocavity with Q = 900. The device operates at telecom wavelengths and shows an enhanced bolometric response at charge neutrality. At 5 K, we obtain a noise equivalent power of about 10 pW Hz–1/2, a record fast thermal relaxation time, <35 ps, and an improved light absorption. However the device can operate even above 300 K with reduced sensitivity. We work out the performance mechanisms and limits of the graphene bolometer and give important insights towards the potential development of practical applications.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/S41565-018-0169-0
