TITLE

Coherent detection of nonlinear nanomechanical motion using a stroboscopic downconversion technique

AUTHOR(S)
Unterreithmeier, Quirin P.; Manus, Stephan; Kotthaus, Jörg P.
PUB. DATE
June 2009
SOURCE
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method is presented that overcomes bandwidth limitations arising in a fiber-optic setup transducing mechanical motion. The reflected light from a sample incorporating a nanomechanical resonator is analyzed. Modulating the incoming laser intensity at a suitably chosen frequency, the mechanically induced oscillation of the reflected light is coherently downconverted to a frequency within the detection bandwidth. Additionally, based on the mechanical nonlinear response, the optical signal can be quantitatively converted into displacement, yielding a sensitivity of [formula] at optical power levels of 20 μW. We detect and image mechanical modes up to the seventh harmonic of the fundamental mode at 7.7 MHz.
ACCESSION #
42961947

 

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