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Conference Paper: Genetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectors

TitleGenetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectors
Authors
KeywordsGenetic algorithms
Group-Ill nitrides
Issue Date2000
PublisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml
Citation
Optical and Infrared Thin Films, San Diego, USA, 1 August 2000, v. 4094, p. 129-136 How to Cite?
AbstractA genetic algorithm (GA) with adaptive mutations has been employed for the design of Bragg reflectors. The algorithm enables three different design types a) composition and thickness of two layers are chosen and the pair is repeated b) two compositions are chosen for the two alternating materials, and thickness of each layer is optimized c) composition and thickness of each layer are optimized. In all cases, the wavelength and composition dependence of the index of refraction is taken into account. Also, it is possible to impose constraints on the composition difference of the neighbouring layers, either with a penalty function or with narrowing the boundaries for possible compositions. This feature is important because the large lattice mismatch between GaN and AlN can cause poor surface morphology, so measured reflectivity would be lower than the calculated one due to the surface roughness. The algorithm enables finding the optimal design for two chosen incident and final media, and it is capable of taking into account the existence of a finite, optically thick substrate. We have investigated two systems: air/sapphire/AlxGa1-xN reflector/GaN and GaN/AlxGa1-xN/air.
Persistent Identifierhttp://hdl.handle.net/10722/46277
ISSN

 

DC FieldValueLanguage
dc.contributor.authorLi, EHerberten_HK
dc.contributor.authorDjurisic, Aleksandra Ben_HK
dc.contributor.authorBundaleski, Nenad Ken_HK
dc.date.accessioned2007-10-30T06:46:20Z-
dc.date.available2007-10-30T06:46:20Z-
dc.date.issued2000en_HK
dc.identifier.citationOptical and Infrared Thin Films, San Diego, USA, 1 August 2000, v. 4094, p. 129-136en_HK
dc.identifier.issn0277-786Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/46277-
dc.description.abstractA genetic algorithm (GA) with adaptive mutations has been employed for the design of Bragg reflectors. The algorithm enables three different design types a) composition and thickness of two layers are chosen and the pair is repeated b) two compositions are chosen for the two alternating materials, and thickness of each layer is optimized c) composition and thickness of each layer are optimized. In all cases, the wavelength and composition dependence of the index of refraction is taken into account. Also, it is possible to impose constraints on the composition difference of the neighbouring layers, either with a penalty function or with narrowing the boundaries for possible compositions. This feature is important because the large lattice mismatch between GaN and AlN can cause poor surface morphology, so measured reflectivity would be lower than the calculated one due to the surface roughness. The algorithm enables finding the optimal design for two chosen incident and final media, and it is capable of taking into account the existence of a finite, optically thick substrate. We have investigated two systems: air/sapphire/AlxGa1-xN reflector/GaN and GaN/AlxGa1-xN/air.en_HK
dc.format.extent362291 bytes-
dc.format.extent3553 bytes-
dc.format.extent14323 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xmlen_HK
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineeringen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsS P I E - the International Society for Optical Proceedings. Copyright © S P I E - International Society for Optical Engineering.en_HK
dc.rightsCopyright 2000 Society of Photo-Optical Instrumentation Engineers. This paper was published in Optical and Infrared Thin Films, San Diego, USA, 1 August 2000, v. 4094, p. 129-136 and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.en_HK
dc.subjectGenetic algorithmsen_HK
dc.subjectGroup-Ill nitridesen_HK
dc.titleGenetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectorsen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0277-786X&volume=4094&spage=129&epage=136&date=2000&atitle=Genetic+algorithm+for+design+of+reflective+filters:+application+to+AlxGa1-xN-based+Bragg+reflectorsen_HK
dc.identifier.emailDjurisic, Aleksandra B: dalek@hku.hken_HK
dc.identifier.authorityDjurisic, Aleksandra B=rp00690en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1117/12.404759en_HK
dc.identifier.scopuseid_2-s2.0-0034543553en_HK
dc.identifier.hkuros63777-
dc.identifier.volume4094en_HK
dc.identifier.spage129en_HK
dc.identifier.epage136en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, EHerbert=7201410087en_HK
dc.identifier.scopusauthoridDjurisic, Aleksandra B=7004904830en_HK
dc.identifier.scopusauthoridBundaleski, Nenad K=6506808994en_HK

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