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Fourier space design of high-Q cavities in standard and compressed hexagonal lattice photonic crystals

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Title Fourier space design of high-Q cavities in standard and compressed hexagonal lattice photonic crystals
 
Creator Srinivasan, Kartik
Painter, Oskar
 
Subject Caltech Library Services
 
Description Building upon the results of recent work [1], we use momentum space design rules to investigate high quality factor (Q) optical cavities in standard and compressed hexagonal lattice photonic crystal (PC) slab waveguides. Beginning with the standard hexagonal lattice, the results of a symmetry analysis are used to determine a cavity geometry that produces a mode whose symmetry immediately leads to a reduction in vertical radiation loss from the PC slab. The Q is improved further by a tailoring of the defect geometry in Fourier space so as to limit coupling between the dominant Fourier components of the defect mode and those momentum components that radiate. Numerical investigations using the finite-difference time-domain (FDTD) method show significant improvement using these methods, with total Q values exceeding 10^5. We also consider defect cavities in a compressed hexagonal lattice, where the lattice compression is used to modify the in-plane bandstructure of the PC lattice, creating new (frequency) degeneracies and modifying the dominant Fourier components found in the defect modes. High Q cavities in this new lattice geometry are designed using the momentum space design techniques outlined above. FDTD simulations of these structures yield Q values in excess of 10^5 with mode volumes of approximately 0.35 cubic half-wavelengths in vacuum.
 
Publisher Optical Society of America
 
Date 2003-03-24
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://authors.library.caltech.edu/277/1/SRIoe03.pdf
Srinivasan, Kartik and Painter, Oskar (2003) Fourier space design of high-Q cavities in standard and compressed hexagonal lattice photonic crystals. Optics Express, 11 (6). pp. 579-593. ISSN 1094-4087. http://resolver.caltech.edu/CaltechAUTHORS:SRIoe03 <http://resolver.caltech.edu/CaltechAUTHORS:SRIoe03>
 
Relation http://resolver.caltech.edu/CaltechAUTHORS:SRIoe03
http://authors.library.caltech.edu/277/