Nonlinear optical switching properties of dye-doped inorganic /organic composite films.
Item
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Title
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Nonlinear optical switching properties of dye-doped inorganic /organic composite films.
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Identifier
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AAI3213138
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identifier
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3213138
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Creator
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Stevens, Nathan.
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Contributor
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Adviser: Daniel L. Akins
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Date
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2006
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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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Chemistry, Physical
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Abstract
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The sol-gel method has been employed in the fabrication of easily processable, high quality composite films consisting of a non-ionic surfactant, Pluronic P123, as the organic component, and silica as the inorganic component. These films served as the host matrix for various organic dyes and quenchers. Ultrafast time-resolved spectroscopic studies revealed that the excited state lifetimes of the intercalated dyes varied from hundreds of picoseconds, to a few nanoseconds in the absence of any energy acceptors or aggregate formation. For cyanine-type dyes, preparative procedures that induced H- and J-type aggregates, led to significant reductions in the excited state lifetimes. In the case of squarylium-, xanthene-, and rhodamine-type dyes, addition of various electron and energy acceptors, resulted in lifetime values in the low picosecond and femtosecond domain. The efficient energy transfer processes observed was indicative of the formation of tightly coupled dye/acceptor complexes. The excellent optical properties, along with the ultrafast optical responses of the intercalated dye/acceptor complexes, made these composite films ideally suited for use as the photonic layer in an all-optical ultrafast switching device.
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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.
