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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24394–24410

Slot-mode-coupled optomechanical crystals

Marcelo Davanço, Jasper Chan, Amir H. Safavi-Naeini, Oskar Painter, and Kartik Srinivasan  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24394-24410 (2012)

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We present a design methodology and analysis of a cavity optomechanical system in which a localized GHz frequency mechanical mode of a nanobeam resonator is evanescently coupled to a high quality factor (Q > 106) optical mode of a separate nanobeam optical cavity. Using separate nanobeams provides flexibility, enabling the independent design and optimization of the optics and mechanics of the system. In addition, the small gap (≈25 nm) between the two resonators gives rise to a slot mode effect that enables a large zero-point optomechanical coupling strength to be achieved, with g/2π > 300 kHz in a Si3N4 system at 980 nm and g/2π ≈ 900 kHz in a Si system at 1550 nm. The fact that large coupling strengths to GHz mechanical oscillators can be achieved in Si3N4 is important, as this material has a broad optical transparency window, which allows operation throughout the visible and near-infrared. As an application of this platform, we consider wide-band optical frequency conversion between 1300 nm and 980 nm, using two optical nanobeam cavities coupled on either side to the breathing mode of a mechanical nanobeam resonator.

© 2012 OSA

OCIS Codes
(230.1040) Optical devices : Acousto-optical devices
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(230.5298) Optical devices : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: July 20, 2012
Revised Manuscript: September 19, 2012
Manuscript Accepted: September 25, 2012
Published: October 10, 2012

Marcelo Davanço, Jasper Chan, Amir H. Safavi-Naeini, Oskar Painter, and Kartik Srinivasan, "Slot-mode-coupled optomechanical crystals," Opt. Express 20, 24394-24410 (2012)

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