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Article overview
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Near-field cavity optomechanics with nanomechanical oscillators | | G. Anetsberger
; O. Arcizet
; Q.P. Unterreithmeier
; E.M. Weig
; J.P. Kotthaus
; T.J. Kippenberg
; | | Date: |
26 Apr 2009 | | Abstract: | Cavity-enhanced radiation pressure coupling between photons and mechanical
degrees of freedom gives rise to dynamical backaction enabling both
amplification and cooling of mechanical motion. Moreover, this optomechanical
coupling allows quantum-limited position measurements. Despite recent proposals
and experiments, however, these distinguishing features of cavity optomechanics
have been limited to micro- and macro-scale mechanical oscillators, owing to
the size disparity of nanoscale objects with the diffraction limit imposed on
propagating fields. Here we demonstrate cavity optomechanics at the nanoscale
by dispersively coupling high quality nanomechanical oscillators to ultra-high
finesse optical microresonators via evanescent fields. Dynamical backaction
mediated by the optical dipole force is observed and salient features such as
laser-like amplification of mechanical motion are reported. Moreover, we
achieve sub-fm/Hz^(1/2) displacement sensitivity (at room temperature),
exceeding the sensitivity of position detectors based on electron flow and
allowing access to quantum-limited readout of nanomechanical motion. The
reported near-field approach provides a versatile platform to which diverse
oscillators, such as nanowires, graphene sheets or carbon nanotubes can be
tunably coupled, extending cavity optomechanics into the realm of
nanomechanical oscillators. This could have wide implications for probing
quantum phenomena of mechanical systems and equally in precision experiments
that are based on ultra-sensitive nanomechanical oscillators. The combination
of picogram, high quality factor nanostrings with ultra-high finesse
microresonators moreover provides a route to quantum optomechanical experiments
at room temperature. | | Source: | arXiv, 0904.4051 | | Services: | Forum | Review | PDF | Favorites | |
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