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Controlling the nonlinearity of silicon nanowire resonators using active feedback

Appl. Phys. Lett. 95, 123116 (2009); doi:10.1063/1.3232232

Published 24 September 2009

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John M. Nichol,1 Eric R. Hemesath,2 Lincoln J. Lauhon,2 and Raffi Budakian1
1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
2Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
We describe the use of nonlinear feedback to tune the cubic nonlinearity of a silicon nanowire resonator. We show that nonlinear feedback can be used to cancel out the native nonlinearity or even change its sign. Here, we demonstrate the usefulness of this technique by using nonlinear feedback to extend the dynamic range of a silicon nanowire parametric amplifier. ©2009 American Institute of Physics
History: Received 4 July 2009; accepted 31 August 2009; published 24 September 2009
Permalink: http://link.aip.org/link/?APPLAB/95/123116/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.35.Be
    Quantum well devices
  • 07.10.Cm
    Micromechanical devices and systems
  • 85.85.+j
    Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (21)
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  20. It is possible in principle to calculate the conversion from ac voltage amplitude Vac to delta by measuring the dependence of omega0 on the dc bias to determine the second derivative of the SiNW-electrode capacitance using the results from Ref. 14. The calculated value is delta/Vac=0.003 22, while the fitted value is delta/Vac=0.002 01. The agreement seems reasonable given that we do not know the exact capacitance of the electrode.
  21. The lower limit of the dynamic range is set by thermal fluctuations which are below the critical amplitude, even for the native case. Also, the peak gain is predicted to be independent of the nonlinearity for small amplitudes. Thus, the amplitudes Anative and Azero for which the gain drops by 1 dB are determined, and the dynamic range increase is calculated as 20 log(Azero/Anative).

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