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Design of a quasi-2D photonic crystal optomechanical cavity with tunable, large x^2-coupling

Kalaee, M. and Paraïso, T. K. and Pfeifer, H. and Painter, O. (2016) Design of a quasi-2D photonic crystal optomechanical cavity with tunable, large x^2-coupling. Optics Express, 24 (19). pp. 21308-21328. ISSN 1094-4087. doi:10.1364/OE.24.021308.

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We present the optical and mechanical design of a mechanically compliant quasi-two-dimensional photonic crystal cavity formed from thin-film silicon in which a pair of linear nanoscale slots are used to create two coupled high-Q optical resonances. The optical cavity supermodes, whose frequencies are designed to lie in the 1500 nm wavelength band, are shown to interact strongly with mechanical resonances of the structure whose frequencies range from a few MHz to a few GHz. Depending upon the symmetry of the mechanical modes and the symmetry of the slot sizes, we show that the optomechanical coupling between the optical supermodes can be either linear or quadratic in the mechanical displacement amplitude. Tuning of the nanoscale slot size is also shown to adjust the magnitude and sign of the cavity supermode splitting 2J, enabling near-resonant motional scattering between the two optical supermodes and greatly enhancing the x^2-coupling strength. Specifically, for the fundamental flexural mode of the central nanobeam of the structure at 10 MHz the per-phonon linear cross-mode coupling rate is calculated to be be g+−/2π=1MHz, corresponding to a per-phonon x^2-coupling rate of g′/2π=1kHz for a mode splitting 2J/2π = 1 GHz which is greater than the radiation-limited supermode linewidths.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Painter, O.0000-0002-1581-9209
Additional Information:© 2016 Optical Society of America. Received 4 Jul 2016; revised 26 Aug 2016; accepted 27 Aug 2016; published 6 Sep 2016. This work was supported by the AFOSR Hybrid Nanophotonics MURI (FA9550-12-1-0024), the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (NSF Grant PHY-1125565) with support of the Gordon and Betty Moore Foundation (GBMF-2644), the Alexander von Humboldt Foundation, and the Max Planck Society.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0024
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationGBMF-2644
Alexander von Humboldt FoundationUNSPECIFIED
Max Planck SocietyUNSPECIFIED
Issue or Number:19
Classification Code:OCIS codes: (130.0130) Integrated optics; (230.5298) Photonic crystals; (230.4555) Coupled resonators; (230.4685) Optical microelectromechanical devices
Record Number:CaltechAUTHORS:20161031-105739502
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Official Citation:M. Kalaee, T. K. Paraïso, H. Pfeifer, and O. Painter, "Design of a quasi-2D photonic crystal optomechanical cavity with tunable, large x2-coupling," Opt. Express 24, 21308-21328 (2016)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71620
Deposited By: George Porter
Deposited On:31 Oct 2016 19:24
Last Modified:11 Nov 2021 04:48

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