Nonlinear optical spectroscopy and imaging of photonic materials and nanostructures.
Item
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Title
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Nonlinear optical spectroscopy and imaging of photonic materials and nanostructures.
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Identifier
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AAI3245088
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identifier
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3245088
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Creator
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Etienne, Michael.
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Contributor
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Adviser: Roger Dorsinville
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Date
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2007
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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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Engineering, Electronics and Electrical | Physics, Optics
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Abstract
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We investigated the nonlinear optical susceptibilities, the nonlinear absorption coefficients and the nonlinear transmission properties of various photonic glasses and crystals. The enhancement of the nonlinear absorption coefficient due to Two-Photon Absorption (TPA) in structural and optical defects in fused silica materials was explored. The correlation between the presence of defects and the increase in TPA was then used to propose a novel in situ 2-D mapping technique for defect detection when growing Potassium Dihydrogen Phosphate (KDP) crystals and their analogs. Open and close aperture Z-scans were also performed on various CdS quantum dots embedded in different generations, G4, G5 and G6, dendrimer films using picosecond and femtosecond pulses between 350 nm and 1 mum. The measured values of the third order nonlinear coefficient were among the highest off-resonance nonlinearities reported for organic and/or hybrid composites materials. We have shown that the nonlinear response in these materials is also a function of the dynamics of the excited states involved and that measurements of the nonlinear optical coefficient with pulses of different duration are directly correlated to the dynamics of the excited states. Finally, the nonlinear optical properties of hybrid systems based on single-wall carbon nanotubes were investigated at different laser pulse durations. These materials show interesting nonlinear transmission properties which makes them perfect candidates for optical limiting applications.
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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.
