CUED Publications database

Graphene-enhanced brillouin optomechanical microresonator for ultrasensitive gas detection

Yao, B and Yu, C and Wu, Y and Huang, SW and Wu, H and Gong, Y and Chen, Y and Li, Y and Wong, CW and Fan, X and Rao, Y (2017) Graphene-enhanced brillouin optomechanical microresonator for ultrasensitive gas detection. Nano Letters, 17. pp. 4996-5002. ISSN 1530-6984

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Abstract

Chemical sensing is one of the most important applications of nanoscience, whose ultimate aim is to seek higher sensitivity. In recent years, graphene with intriguing quantum properties has spurred dramatic advances ranging from materials science to optoelectronics and mechanics, showing its potential to realize individual molecule solid-state sensors. However, for optical sensing the single atom thickness of graphene greatly limits the light-graphene interactions, bottlenecking their performances. Here we demonstrate a novel approach based on the forward phase-matched Brillouin optomechanics in a graphene inner-deposited high Q (>2 × 10 ) microfluidic resonator, expanding the "electron-photon" interaction in conventional graphene optical devices to the "electron-phonon-photon" process. The molecular adsorption induced surface elastic modulation in graphene enables the Brillouin optomechanical modes (mechanical Q ≈ 43,670) extremely sensitive (200 kHz/ppm) in ammonia gas detection, achieving a noise equivalent detection limit down to 1 ppb and an unprecedented dynamic range over five orders-of-magnitude with fast response. This work provides a new platform for the researches of graphene-based optomechanics, nanophotonics, and optical sensing. 6

Item Type: Article
Uncontrolled Keywords: Brillouin optomechnics Graphene fiber interrogated optics ultrasensitive gas detection whispering gallery mode microresonator
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 20 Dec 2017 20:05
Last Modified: 15 Apr 2021 06:50
DOI: 10.1021/acs.nanolett.7b02176