Linear and nonlinear optical properties of semiconductor microcavities exhibiting normal-mode coupling

Persistent Link:
http://hdl.handle.net/10150/282631
Title:
Linear and nonlinear optical properties of semiconductor microcavities exhibiting normal-mode coupling
Author:
Nelson, Thomas Reed, 1967-
Issue Date:
1998
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 work in this dissertation has focused on the optical properties of semiconductor microcavities containing one or more high-quality, narrow-linewidth quantum wells, and how the appropriate design and growth of such structures can result in a nonperturbative coupling of light and matter. We apply the term Normal-Mode Coupling to describe this interaction, as it can be ascribed to the dipole interaction lifting the degeneracy between field and emitter resonances, resulting in a strongly coupled two- (or more-) oscillator system. Linear reflection, transmission, and photoluminescence measurements for the two-oscillator systems show two dips or peaks near zero detuning, whereas samples with two nonidentical quantum wells coupled to the microcavity display a three-resonance behavior. It is demonstrated that the linewidths of these samples are not only functions of the uncoupled cavity and exciton lineshapes, but are also sensitive to the local variations of the index of refraction and optical absorption. To this end, absorption measurements of multiple-quantum-well samples lead to a phenomenological derivation of the optical susceptibility inclusive of the influence of structural disorder. Use of this susceptibility in a transfer-matrix calculation then gives good agreement with experiment. The ability to see well-resolved normal-mode coupling peaks at room temperature is also demonstrated. Here, the distributed Bragg reflector mirror layers are created through oxidation of the AlAs mirror layers, resulting in increased field confinement and larger splitting. The superlative splitting-to-linewidth ratios at resonance for these samples make them ideal candidates for nonlinear studies. Pump-probe transmission and photoluminescence studies utilizing both resonant and nonresonant pump excitation are presented. Nonlinear saturation of the quantum-well excitonic resonance leads to increased absorption at the normal-mode coupling transmission peaks, which reduces their amplitude. For relatively small positive cavity-exciton detunings, there is a good correspondence between photoluminescence crossover and the opening up of probe transmission at the uncoupled cavity-mode resonance. It is demonstrated that this occurs when the exciton absorption is bleached, and the coupling undergoes a transition from nonperturbative to weak. In this case, nonlinear absorption measurements on a cavityless multiple-quantum-well sample provide the nonlinear optical susceptibility for use in a transfer-matrix simulation for the off-resonant pumping experiments.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Physics, Condensed Matter.; Physics, Optics.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Physics
Degree Grantor:
University of Arizona
Advisor:
Khitrova, Galina; Wright, Ewan

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleLinear and nonlinear optical properties of semiconductor microcavities exhibiting normal-mode couplingen_US
dc.creatorNelson, Thomas Reed, 1967-en_US
dc.contributor.authorNelson, Thomas Reed, 1967-en_US
dc.date.issued1998en_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 work in this dissertation has focused on the optical properties of semiconductor microcavities containing one or more high-quality, narrow-linewidth quantum wells, and how the appropriate design and growth of such structures can result in a nonperturbative coupling of light and matter. We apply the term Normal-Mode Coupling to describe this interaction, as it can be ascribed to the dipole interaction lifting the degeneracy between field and emitter resonances, resulting in a strongly coupled two- (or more-) oscillator system. Linear reflection, transmission, and photoluminescence measurements for the two-oscillator systems show two dips or peaks near zero detuning, whereas samples with two nonidentical quantum wells coupled to the microcavity display a three-resonance behavior. It is demonstrated that the linewidths of these samples are not only functions of the uncoupled cavity and exciton lineshapes, but are also sensitive to the local variations of the index of refraction and optical absorption. To this end, absorption measurements of multiple-quantum-well samples lead to a phenomenological derivation of the optical susceptibility inclusive of the influence of structural disorder. Use of this susceptibility in a transfer-matrix calculation then gives good agreement with experiment. The ability to see well-resolved normal-mode coupling peaks at room temperature is also demonstrated. Here, the distributed Bragg reflector mirror layers are created through oxidation of the AlAs mirror layers, resulting in increased field confinement and larger splitting. The superlative splitting-to-linewidth ratios at resonance for these samples make them ideal candidates for nonlinear studies. Pump-probe transmission and photoluminescence studies utilizing both resonant and nonresonant pump excitation are presented. Nonlinear saturation of the quantum-well excitonic resonance leads to increased absorption at the normal-mode coupling transmission peaks, which reduces their amplitude. For relatively small positive cavity-exciton detunings, there is a good correspondence between photoluminescence crossover and the opening up of probe transmission at the uncoupled cavity-mode resonance. It is demonstrated that this occurs when the exciton absorption is bleached, and the coupling undergoes a transition from nonperturbative to weak. In this case, nonlinear absorption measurements on a cavityless multiple-quantum-well sample provide the nonlinear optical susceptibility for use in a transfer-matrix simulation for the off-resonant pumping experiments.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectPhysics, Condensed Matter.en_US
dc.subjectPhysics, Optics.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplinePhysicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorKhitrova, Galinaen_US
dc.contributor.advisorWright, Ewanen_US
dc.identifier.proquest9829371en_US
dc.identifier.bibrecord.b38554446en_US
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