Systematic design of slow-light photonic waveguides

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Abstract

A pulse-delaying optimization scheme based on topology optimization for transient response of photonic crystal structures (PhCs) is formulated to obtain slow-light devices. The optimization process is started from a qualified W1 PhC waveguide design with group index ng≈40 obtained from a simple Edisonian parameter search. Based on this, the proposed pulse delaying and subsequent pulse restoring strategies yield a design that increases the group index by 75% to ng≈70±10% for an operational full-width at half-maximum (FWHM) bandwidth BFWHM=6 nm, and simultaneously minimizes interface penalty losses between the access ridge and the W1 PhC waveguide. To retain periodicity and symmetry, the active design set is limited to the in-/outlet region and a distributed supercell, and manufacturability is further enhanced by density filtering techniques combined with material phase projections.
Original languageEnglish
JournalOptical Society of America. Journal B: Optical Physics
Volume28
Issue number10
Pages (from-to)2374-2382
ISSN0740-3224
DOIs
Publication statusPublished - 2011

Bibliographical note

This paper was published in Optical Society of America. Journal B: Optical Physics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org.globalproxy.cvt.dk/josab/abstract.cfm?URI=josab-28-10-2374. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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