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Momentum space design of high-Q photonic crystal optical cavities

Srinivasan, Kartik and Painter, Oskar (2002) Momentum space design of high-Q photonic crystal optical cavities. Optics Express, 10 (15). pp. 670-684. ISSN 1094-4087.

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The design of high quality factor (Q) optical cavities in two dimensional photonic crystal (PC) slab waveguides based upon a momentum space picture is presented. The results of a symmetry analysis of defect modes in hexagonal and square host photonic lattices are used to determine cavity geometries that produce modes which by their very symmetry reduce the vertical radiation loss from the PC slab. Further improvements in the Q are achieved through tailoring of the defect geometry in Fourier space to limit coupling between the dominant momentum components of a given defect mode and those momentum components which are either not reflected by the PC mirror or which lie within the radiation cone of the cladding surrounding the PC slab. Numerical investigations using the finite-difference timedomain (FDTD) method predict that radiation losses can be significantly suppressed through these methods, culminating with a graded square lattice design whose total Q approaches 105 with a mode volume of approximately 0.25 cubic half-wavelengths in vacuum.

Item Type:Article
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Painter, Oskar0000-0002-1581-9209
Additional Information:© 2002 Optical Society of America. Received June 03, 2002; Revised July 17, 2002.
Subject Keywords:OCIS codes: (230.5750) Resonators; (140.5960) Semiconductor lasers
Issue or Number:15
Record Number:CaltechAUTHORS:SRIoe02
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:276
Deposited By: Archive Administrator
Deposited On:16 May 2005
Last Modified:02 Oct 2019 22:32

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