Evanescent-field optical readout of graphene mechanical motion at room temperature

Cole, Robin M., Brawley, George A., Adiga, Vivekananda P., Alba, Roberto De, Parpia, Jeevak M., Ilic, Bojan, Craighead, Harold G. and Bowen, Warwick P. (2015) Evanescent-field optical readout of graphene mechanical motion at room temperature. Physical Review Applied, 3 2: 024004-1-024004-7. doi:10.1103/PhysRevApplied.3.024004

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Author Cole, Robin M.
Brawley, George A.
Adiga, Vivekananda P.
Alba, Roberto De
Parpia, Jeevak M.
Ilic, Bojan
Craighead, Harold G.
Bowen, Warwick P.
Title Evanescent-field optical readout of graphene mechanical motion at room temperature
Journal name Physical Review Applied   Check publisher's open access policy
ISSN 2331-7019
Publication date 2015-02-17
Year available 2015
Sub-type Article (original research)
DOI 10.1103/PhysRevApplied.3.024004
Open Access Status File (Publisher version)
Volume 3
Issue 2
Start page 024004-1
End page 024004-7
Total pages 7
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract Graphene mechanical resonators have recently attracted considerable attention for use in precision force-and mass-sensing applications. To date, readout of their oscillatory motion typically requires cryogenic conditions to achieve high sensitivity, restricting their range of applications. Here we report the demonstration of an evanescent optical readout of graphene motion, using a scheme which does not require cryogenic conditions and exhibits enhanced sensitivity and bandwidth at room temperature. We utilize a high-Q microsphere to enable the evanescent readout of a 70-mu m-diameter graphene drum resonator with a signal-to-noise ratio of greater than 25 dB, corresponding to a transduction sensitivity of S-N(1/2) =2.6 x 10(-13) mHz(-1/2). The sensitivity of force measurements using this resonator is limited by the thermal noise driving the resonator, corresponding to a force sensitivity of F-min = 1.5 x 10(-16) NHz(-1/2) with a bandwidth of 35 kHz at room temperature (T = 300 K). Measurements on a 30-mu m graphene drum have sufficient sensitivity to resolve the lowest three thermally driven mechanical resonances. The graphene drums couple both dispersively and dissipatively to the optical field with coupling coefficients of G/2 pi=0.21 MHz/nm and Gamma(dp)/2 pi = 0.1 MHz/nm, respectively.
Formatted abstract
Graphene mechanical resonators have recently attracted considerable attention for use in precision force- and mass-sensing applications. To date, readout of their oscillatory motion typically requires cryogenic conditions to achieve high sensitivity, restricting their range of applications. Here we report the demonstration of an evanescent optical readout of graphene motion, using a scheme which does not require cryogenic conditions and exhibits enhanced sensitivity and bandwidth at room temperature. We utilize a high-Q microsphere to enable the evanescent readout of a 70−μm-diameter graphene drum resonator with a signal-to-noise ratio of greater than 25 dB, corresponding to a transduction sensitivity of S1/2N=2.6×10−13  m Hz−1/2. The sensitivity of force measurements using this resonator is limited by the thermal noise driving the resonator, corresponding to a force sensitivity of Fmin=1.5×10−16  N Hz−1/2 with a bandwidth of 35 kHz at room temperature (T=300  K). Measurements on a 30−μm graphene drum have sufficient sensitivity to resolve the lowest three thermally driven mechanical resonances. The graphene drums couple both dispersively and dissipatively to the optical field with coupling coefficients of G/2π=0.21  MHz/nm and Γdp/2π=0.1  MHz/nm, respectively.
Keyword Physics, Applied
Physics
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CE110001013
DMR 1120296
DP140100734
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 26 Apr 2015, 18:39:11 EST by Dr Warwick Bowen on behalf of Physics