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Article: Double quantum-well phase modulators using surface acoustic waves

TitleDouble quantum-well phase modulators using surface acoustic waves
Authors
Issue Date1999
PublisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml
Citation
Proceedings Of Spie - The International Society For Optical Engineering, 1999, v. 3620, p. 45-56 How to Cite?
AbstractElectro-optic modulators using the interaction of surface acoustic waves (SAWs) with III-V semiconductor multiple quantum well structures have gained interests. A SAW induces potential field which provides the phase modulation. In order to improve the phase modulation, an AlGaAs/GaAs asymmetric double quantum well (DQW) optical phase modulator using SAWs is investigated theoretically. The optimization steps of the DQW structure are discussed. The optimized phase modulator structure is found to contain a five-period DQW active region. Analysis of the modulation characteristics show that by using the asymmetric DQW, the large change of the induced potential at the surface and thus large modification of the QW structure can be utilized. The modification of each QW structure is consistent, although this consistency is not always preserved in typical SAW devices. Consequently, the change of refractive index in each of the five DQWs is almost identical. Besides, the change of effective refractive index is 10 times larger here in comparison to a modulator with a five periods single QW as the active region and thus produces a larger phase modulation. In addition, a long wavelength and a low SAW power required here increase the size of the SAW transducer and simplify its fabrication.
Persistent Identifierhttp://hdl.handle.net/10722/155095
ISSN

 

DC FieldValueLanguage
dc.contributor.authorChoy, Wallace CHen_US
dc.contributor.authorLi, EHerberten_US
dc.contributor.authorWeiss, Bernard Len_US
dc.date.accessioned2012-08-08T08:31:50Z-
dc.date.available2012-08-08T08:31:50Z-
dc.date.issued1999en_US
dc.identifier.citationProceedings Of Spie - The International Society For Optical Engineering, 1999, v. 3620, p. 45-56en_US
dc.identifier.issn0277-786Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/155095-
dc.description.abstractElectro-optic modulators using the interaction of surface acoustic waves (SAWs) with III-V semiconductor multiple quantum well structures have gained interests. A SAW induces potential field which provides the phase modulation. In order to improve the phase modulation, an AlGaAs/GaAs asymmetric double quantum well (DQW) optical phase modulator using SAWs is investigated theoretically. The optimization steps of the DQW structure are discussed. The optimized phase modulator structure is found to contain a five-period DQW active region. Analysis of the modulation characteristics show that by using the asymmetric DQW, the large change of the induced potential at the surface and thus large modification of the QW structure can be utilized. The modification of each QW structure is consistent, although this consistency is not always preserved in typical SAW devices. Consequently, the change of refractive index in each of the five DQWs is almost identical. Besides, the change of effective refractive index is 10 times larger here in comparison to a modulator with a five periods single QW as the active region and thus produces a larger phase modulation. In addition, a long wavelength and a low SAW power required here increase the size of the SAW transducer and simplify its fabrication.en_US
dc.languageengen_US
dc.publisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xmlen_US
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineeringen_US
dc.titleDouble quantum-well phase modulators using surface acoustic wavesen_US
dc.typeArticleen_US
dc.identifier.emailChoy, Wallace CH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, Wallace CH=rp00218en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0032635717en_US
dc.identifier.volume3620en_US
dc.identifier.spage45en_US
dc.identifier.epage56en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridChoy, Wallace CH=7006202371en_US
dc.identifier.scopusauthoridLi, EHerbert=7201410087en_US
dc.identifier.scopusauthoridWeiss, Bernard L=7402309717en_US

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