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Studies of the Optical Characteristic of Quantum Confined Structure

Author: LiZuo
Tutor: XiongGuiGuang
School: Wuhan University
Course: Optics
Keywords: Quantum confinement structure Titania Raman Photoluminescence Bloch equation Quantum beats
CLC: O431.2
Type: Master's thesis
Year: 2005
Downloads: 141
Quote: 0
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Abstract


This paper mainly studied the optical properties of the quantum confinement structure of titanium dioxide , as well as in time-resolved degenerate four-wave mixing conditions , In x Ga 1-x N / GaN quantum wells in the light hole exciton and heavy-hole exciton quantum coherence characteristics . In the first chapter , the quantum confinement materials development and application prospects , and the characteristics of the quantum confinement structure and physical properties , and several quantum confinement structure analysis method . In the second chapter , the preparation of sodium dodecyl benzene sulfonate ( CF ) -coated titania quantum confinement structure , to study at room temperature, Raman spectroscopy , fluorescence spectroscopy and photoluminescence spectra . Raman spectroscopy analysis showed that , the sample sharply in the two structures of anatase and rutile TiO 2 < / sub > coexist . Its Raman peak of bulk TiO 2 compared to the peak position of the red shift , this phenomenon is analyzed and discussed . The fluorescence spectrum measurement results show that , at room temperature , the sample of the intrinsic optical bandgap of 3.035eV, at 448nm , 466nm , 480nm appears at the exciton peak , and the block body TiO 2 < / sub > compared to its intrinsic absorption band blue shift and broadening , which analyzes the causes . Light EL spectrum excitons are discussed, and focus on the research on which the exciton peak appears on the left side of the excitation peak (corresponding to high - energy photons at ) conversion mechanism . In the third chapter , the semi - classical theory based on laser -matter interaction , the Bloch equation , time-resolved degenerate four-wave mixing conditions , In x Ga 1 - x < / sub > N / GaN quantum well light-hole exciton and the heavy-hole exciton quantum coherence characteristics . Theoretical calculations show that the time-resolved detection signal by time modulation , four-wave mixing in with typical quantum beats characteristics , the the beat frequency cycles with IN x < / sub > Ga 1 - x < / sub > N in content / GaN quantum wells decreases with an increase , when x = 0.125 , the beat period 120fs , when x = 0.25 , the beat period of 180fs . Fraction related to the strength of the signal and the oscillation amplitude and the well material optical polarization back significantly enhanced with decreasing retire Fraction combination of the quantum confinement effect of the quantum well material on the back Fraction and signal strength . to analyze the relationship .

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
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