Optical properties of quantum heterostructures.
Item
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Title
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Optical properties of quantum heterostructures.
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Identifier
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AAI3187443
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identifier
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3187443
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Creator
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Erementchouk, Mikhail V.
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Contributor
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Adviser: Lev I. Deych
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Date
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2005
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Condensed Matter
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Abstract
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The thesis is devoted to consideration of optical properties of quantum heterostructures. These structures are characterized by a spatial modulation of the dielectric function and a periodic arrangement of optically active elements. The coexistence of two different channels of the light interaction with the matter makes the quantum heterostructures belonging to the new class of structures---resonant photonic crystals. In the present thesis effective approaches have been developed for an effective description of the exciton polariton dispersion law and optical spectra of finite structures. In particular, the polariton spectrum is shown to consist of passing bands separated by forbidden gaps. The structure of the gaps essentially depends on the relation between the exciton resonant frequency and the frequencies of the photonic band gaps existing in a passive photonic crystal characterized by the same modulation of the dielectric function. The resonant condition for formation of a wide solid stop-band is obtained and analyzed in detail for different structures. The reflection and transmission spectra are effectively described by effective excitonic susceptibility and effective optical widths of the quantum wells. These effective quantities are determined by the dielectric environment of the quantum wells and naturally take into account the dependence of the reflection and transmission spectra on angle of propagation of the electromagnetic waves and their polarization state. The information obtained for the polariton spectrum and reflection and transmission properties of quantum heterostructures is used for the solution of a problem of the exciton luminescence in resonant photonic crystals. In particular, it is shown that the large scale form of the luminescence spectra is determined by the form of the polariton forbidden gap while its fine structure is the result of a strong frequency dependence of the transmission coefficient near the band edges.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
