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Optical and mechanical design of a "zipper" photonic crystal optomechanical cavity

Chan, Jasper and Eichenfield, Matt and Camacho, Ryan and Painter, Oskar (2009) Optical and mechanical design of a "zipper" photonic crystal optomechanical cavity. Optics Express, 17 (5). pp. 3802-3817. ISSN 1094-4087. doi:10.1364/OE.17.003802.

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Design of a doubly-clamped beam structure capable of localizing mechanical and optical energy at the nanoscale is presented. The optical design is based upon photonic crystal concepts in which patterning of a nanoscale-cross-section beam can result in strong optical localization to an effective optical mode volume of 0.2 cubic wavelengths ((λc)^3). By placing two identical nanobeams within the near field of each other, strong optomechanical coupling can be realized for differential motion between the beams. Current designs for thin film silicon nitride beams at a wavelength of λ = 1.5 μm indicate that such structures can simultaneously realize an optical Q-factor of 7×10^6, motional mass mu ~ 40 picograms, mechanical mode frequency ΩM/2π ~ 170 MHz, and an optomechanical coupling factor (gOM ≡ dω_c/dx = ω_c/LOM) with effective length LOM ~ λ = 1.5 μm.

Item Type:Article
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Painter, Oskar0000-0002-1581-9209
Additional Information:© 2009 Optical Society of America. Received 5 Jan 2009; revised 25 Feb 2009; accepted 25 Feb 2009; published 26 Feb 2009. The authors would like to thank Qiang Lin for extensive discussions regarding the calculation of motional mass and optomechanical coupling. The authors would also like to thank Patrick Herring for some of the initial ideas regarding gradient force optomechanical structures. This work was supported by a DARPA seed grant, managed by Prof. Henryk Temkin, and a NSF EMT grant.
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:Photonic Crystals
Issue or Number:5
Classification Code:OCIS Codes: (230.5750) Optical devices : Resonators; (230.5298) Optical devices : Photonic crystals
Record Number:CaltechAUTHORS:20090413-110445181
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13950
Deposited By: Tony Diaz
Deposited On:15 Jul 2009 22:57
Last Modified:08 Nov 2021 22:41

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