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Conference Paper: Genetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectors
Title | Genetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectors |
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Authors | |
Keywords | Genetic algorithms Group-Ill nitrides |
Issue Date | 2000 |
Publisher | S 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. In Proceedings of SPIE, 2000, v. 4094, p. 129-136 How to Cite? |
Abstract | A 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 Identifier | http://hdl.handle.net/10722/46277 |
ISSN | 2023 SCImago Journal Rankings: 0.152 |
DC Field | Value | Language |
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dc.contributor.author | Li, EHerbert | en_HK |
dc.contributor.author | Djurisic, Aleksandra B | en_HK |
dc.contributor.author | Bundaleski, Nenad K | en_HK |
dc.date.accessioned | 2007-10-30T06:46:20Z | - |
dc.date.available | 2007-10-30T06:46:20Z | - |
dc.date.issued | 2000 | en_HK |
dc.identifier.citation | Optical and Infrared Thin Films, San Diego, USA, 1 August 2000. In Proceedings of SPIE, 2000, v. 4094, p. 129-136 | - |
dc.identifier.issn | 0277-786X | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/46277 | - |
dc.description.abstract | A 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.extent | 362291 bytes | - |
dc.format.extent | 3553 bytes | - |
dc.format.extent | 14323 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.publisher | S P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml | en_HK |
dc.relation.ispartof | Proceedings of SPIE | - |
dc.rights | Copyright 2000 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited. This article is available online at https://doi.org/10.1117/12.404759 | - |
dc.subject | Genetic algorithms | en_HK |
dc.subject | Group-Ill nitrides | en_HK |
dc.title | Genetic algorithm for design of reflective filters: Application to AlxGa1-xN based Bragg reflectors | en_HK |
dc.type | Conference_Paper | en_HK |
dc.identifier.openurl | http://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+reflectors | en_HK |
dc.identifier.email | Djurisic, Aleksandra B: dalek@hku.hk | en_HK |
dc.identifier.authority | Djurisic, Aleksandra B=rp00690 | en_HK |
dc.description.nature | published_or_final_version | en_HK |
dc.identifier.doi | 10.1117/12.404759 | en_HK |
dc.identifier.scopus | eid_2-s2.0-0034543553 | en_HK |
dc.identifier.hkuros | 63777 | - |
dc.identifier.volume | 4094 | en_HK |
dc.identifier.spage | 129 | en_HK |
dc.identifier.epage | 136 | en_HK |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Li, EHerbert=7201410087 | en_HK |
dc.identifier.scopusauthorid | Djurisic, Aleksandra B=7004904830 | en_HK |
dc.identifier.scopusauthorid | Bundaleski, Nenad K=6506808994 | en_HK |
dc.identifier.issnl | 0277-786X | - |