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An optical-fiber-based probe for photonic crystal microcavities

Srinivasan, Kartik and Barclay, Paul E. and Borselli, Matthew and Painter, Oskar Jon (2005) An optical-fiber-based probe for photonic crystal microcavities. IEEE Journal on Selected Areas in Communications, 23 (7). pp. 1321-1329. ISSN 0733-8716. http://resolver.caltech.edu/CaltechAUTHORS:SRIieeejsac06

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Abstract

We review a novel method for characterizing both the spectral and spatial properties of resonant cavities within two- dimensional photonic crystals (PCs). An optical fiber taper serves as an external waveguide probe whose micron-scale field is used to source and couple light from the cavity modes, which appear as resonant features in the taper's wavelength-dependent transmission spectrum when it is placed within the cavity's near field. Studying the linewidth and depth of these resonances as a function of the taper's position with respect to the resonator produces quantitative measurements of the quality factor (Q) and modal volume (V/sub eff/) of the resonant cavity modes. Polarization information about the cavity modes can be obtained by studying their depths of coupling when the cavity is probed along different axes by the taper. This fiber-based technique has been used to measure Q/spl sim/40,000 and V/sub eff//spl sim/0.9 cubic wavelengths in a graded square lattice PC microcavity fabricated in silicon. The speed and versatility of this fiber-based probe is highlighted, and a discussion of its applicability to other wavelength-scale resonant elements is given.


Item Type:Article
Additional Information:© Copyright 2005 IEEE. Reprinted with permission. Manuscript received June 28, 2004; revised September 29, 2004. [Posted online: 2005-07-05] This work was supported in part by the Charles Lee Powell Foundation. The work of K. Srinivasan was supported in part by the Hertz Foundation. The work of P. Barclay was supported in part by the Powell Foundation. The work of M. Borselli was supported in part by the Moore Foundation, in part by NPSC, and in part by HRL Laboratories.
Subject Keywords:Microcavity, photonic crystals (PCs), quantum optics
Record Number:CaltechAUTHORS:SRIieeejsac06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SRIieeejsac06
Alternative URL:http://dx.doi.org/10.1109/JSAC.2005.851212
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6816
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:23 Dec 2006
Last Modified:26 Dec 2012 09:25

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