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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 9 — May. 6, 2013
  • pp: 11227–11236

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Justin D. Cohen, Seán M. Meenehan, and Oskar Painter  »View Author Affiliations

Optics Express, Vol. 21, Issue 9, pp. 11227-11236 (2013)

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A significant challenge in the development of chip-scale cavity-optomechanical devices as testbeds for quantum experiments and classical metrology lies in the coupling of light from nanoscale optical mode volumes to conventional optical components such as lenses and fibers. In this work we demonstrate a high-efficiency, single-sided fiber-optic coupling platform for optomechanical cavities. By utilizing an adiabatic waveguide taper to transform a single optical mode between a photonic crystal zipper cavity and a permanently mounted fiber, we achieve a collection efficiency for intracavity photons of 52% at the cavity resonance wavelength of λ ≈ 1538 nm. An optical balanced homodyne measurement of the displacement fluctuations of the fundamental in-plane mechanical resonance at 3.3 MHz reveals that the imprecision noise floor lies a factor of 2.8 above the standard quantum limit (SQL) for continuous position measurement, with a predicted total added noise of 1.4 phonons at the optimal probe power. The combination of extremely low measurement noise and robust fiber alignment presents significant progress towards single-phonon sensitivity for these sorts of integrated micro-optomechanical cavities.

© 2013 OSA

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(230.5298) Optical devices : Photonic crystals
(120.4880) Instrumentation, measurement, and metrology : Optomechanics

ToC Category:
Optical Devices

Original Manuscript: February 8, 2013
Revised Manuscript: April 22, 2013
Manuscript Accepted: April 22, 2013
Published: May 1, 2013

Justin D. Cohen, Seán M. Meenehan, and Oskar Painter, "Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction," Opt. Express 21, 11227-11236 (2013)

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