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Beyond the Rayleigh scattering limit in high-Q silicon microdisks: theory and experiment

Borselli, Matthew and Johnson, Thomas J. and Painter, Oskar (2005) Beyond the Rayleigh scattering limit in high-Q silicon microdisks: theory and experiment. Optics Express, 13 (5). pp. 1515-1530. ISSN 1094-4087.

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Using a combination of resist reflow to form a highly circular etch mask pattern and a low-damage plasma dry etch, high-quality-factor silicon optical microdisk resonators are fabricated out of silicon-on-insulator (SOI) wafers. Quality factors as high as Q = 5×10^6 are measured in these microresonators, corresponding to a propagation loss coefficient as small as α ~ 0.1 dB/cm. The different optical loss mechanisms are identified through a study of the total optical loss, mode coupling, and thermally-induced optical bistability as a function of microdisk radius (5-30 µm). These measurements indicate that optical loss in these high-Q microresonators is limited not by surface roughness, but rather by surface state absorption and bulk free-carrier absorption.

Item Type:Article
Additional Information:© 2005 Optical Society of America Original Manuscript: February 2, 2005; Revised Manusctipt: January 31, 2005; Published: March 7, 2005 This work was supported by DARPA through the EPIC program, and by the Charles Lee Powell Foundation. The authors would like to thank Paul Barclay and Kartik Srinivasan for useful discussions. M.B. thanks the Moore Foundation, NPSC, and HRL Laboratories, and T.J. thanks the Powell Foundation for their graduate fellowship support.
Subject Keywords:(190.1450) Nonlinear optics : Bistability; (190.4870) Nonlinear optics : Optically induced thermo-optical effects; (230.5750) Optical devices : Resonators
Record Number:CaltechAUTHORS:BORoe05
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ID Code:1760
Deposited By: Archive Administrator
Deposited On:16 Feb 2006
Last Modified:08 Dec 2014 18:48

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