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Design of optomechanical cavities and waveguides on a simultaneous bandgap phononic-photonic crystal slab

Safavi-Naeini, Amir H. and Painter, Oskar (2010) Design of optomechanical cavities and waveguides on a simultaneous bandgap phononic-photonic crystal slab. Optics Express, 18 (14). pp. 14926-14943. ISSN 1094-4087.

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In this paper we study and design quasi-2D optomechanical crystals, waveguides, and resonant cavities formed from patterned slabs. Two-dimensional periodicity allows for in-plane pseudo-bandgaps in frequency where resonant optical and mechanical excitations localized to the slab are forbidden. By tailoring the unit cell geometry, we show that it is possible to have a slab crystal with simultaneous optical and mechanical pseudo-bandgaps, and for which optical waveguiding is not compromised. We then use these crystals to design optomechanical cavities in which strongly interacting, co-localized photonic-phononic resonances occur. A resonant cavity structure formed by perturbing a "linear defect" waveguide of optical and acoustic waves in a silicon optomechanical crystal slab is shown to support an optical resonance at wavelength λ_0 ≈ 1.5 μm and a mechanical resonance of frequency ω_m/2π ≈ 9.5 GHz. These resonances, due to the simultaneous pseudo-bandgap of the waveguide structure, are simulated to have optical and mechanical radiation-limited Q-factors greater than 10^7. The optomechanical coupling of the optical and acousticresonances in this cavity due to radiation pressure is also studied, with a quantum conversion rate, corresponding to the scattering rate of a single cavity photon via a single cavity phonon, calculated to be g/2π = 292 kHz.

Item Type:Article
Related URLs:
URLURL TypeDescription
Safavi-Naeini, Amir H.0000-0001-6176-1274
Painter, Oskar0000-0002-1581-9209
Additional Information:© 2010 Optical Society of America. Received 29 Mar 2010; revised 22 Jun 2010; accepted 24 Jun 2010; published 29 Jun 2010. This work was supported by the DARPA/MTO ORCHID program through a grant from AFOSR. ASN gratefully acknowledges support from NSERC.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Issue or Number:14
Classification Code:OCIS codes: (230.1040) Acousto-optical devices; (230.5298) Photonic crystals; Optomechanics; Optomechanical crystals.
Record Number:CaltechAUTHORS:20100805-085450609
Persistent URL:
Official Citation:Amir H. Safavi-Naeini and Oskar Painter, "Design of optomechanical cavities and waveguides on a simultaneous bandgap phononic-photonic crystal slab," Opt. Express 18, 14926-14943 (2010)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19287
Deposited By: Tony Diaz
Deposited On:05 Aug 2010 17:09
Last Modified:09 Mar 2020 13:19

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