Optical properties of cadmium sulfide and cadmium telluride microcrystallites in glass and an optical associative memory.

Persistent Link:
http://hdl.handle.net/10150/184966
Title:
Optical properties of cadmium sulfide and cadmium telluride microcrystallites in glass and an optical associative memory.
Author:
Esch, Victor Clark.
Issue Date:
1990
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The linear and nonlinear properties of CdTe and CdS microcrystallites, or 'quantum dots', grown in glass were investigated. The CdTe quantum dots investigated, the first ever grown, demonstrated the most confinement peaks observed for quantum dots of this kind. The linear absorption for CdTe was modeled. The growth of the microcrystallites in glass was optimized using quantum confined behavior as the criteria. The temperature dependent red shift of the band gap, and the phonon broadening of the 1s-1s transition feature were measured. The fluorescence spectra for CdS and CdTe were taken and found to be different in some respects. The quantum confined Franz-Keldysh effect was modeled and measured for CdTe. Very good agreement with theory was found. The effect of trap state electric fields was considered. The Franz-Keldysh effect for bulk-like microcrystallites was observed. The results for CdS quantum dots were not similar to that of CdTe. The differential absorption for CdS and CdTe was measured with nanosecond time scale optical excitation. Typical differential signals were observed, and long lifetimes were measured. Microsecond time scale excitation was used for CdTe and exceptionally long lifetimes were seen. Differential signals were found to correlate to fluorescence lifetimes. The differential signals were attributed to trap state electric fields (coulombic interaction) with at least two lifetime components. Photodarkening was considered in the context of this trap state scheme.
Type:
text; Dissertation-Reproduction (electronic)
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Optical Sciences; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Gibbs, Hyatt M.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleOptical properties of cadmium sulfide and cadmium telluride microcrystallites in glass and an optical associative memory.en_US
dc.creatorEsch, Victor Clark.en_US
dc.contributor.authorEsch, Victor Clark.en_US
dc.date.issued1990en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe linear and nonlinear properties of CdTe and CdS microcrystallites, or 'quantum dots', grown in glass were investigated. The CdTe quantum dots investigated, the first ever grown, demonstrated the most confinement peaks observed for quantum dots of this kind. The linear absorption for CdTe was modeled. The growth of the microcrystallites in glass was optimized using quantum confined behavior as the criteria. The temperature dependent red shift of the band gap, and the phonon broadening of the 1s-1s transition feature were measured. The fluorescence spectra for CdS and CdTe were taken and found to be different in some respects. The quantum confined Franz-Keldysh effect was modeled and measured for CdTe. Very good agreement with theory was found. The effect of trap state electric fields was considered. The Franz-Keldysh effect for bulk-like microcrystallites was observed. The results for CdS quantum dots were not similar to that of CdTe. The differential absorption for CdS and CdTe was measured with nanosecond time scale optical excitation. Typical differential signals were observed, and long lifetimes were measured. Microsecond time scale excitation was used for CdTe and exceptionally long lifetimes were seen. Differential signals were found to correlate to fluorescence lifetimes. The differential signals were attributed to trap state electric fields (coulombic interaction) with at least two lifetime components. Photodarkening was considered in the context of this trap state scheme.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineOptical Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorGibbs, Hyatt M.en_US
dc.contributor.committeememberPeyghambarian, Nasseren_US
dc.contributor.committeememberKhitrova, Galinaen_US
dc.identifier.proquest9022104en_US
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