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- 2Anagaw, Amsalu Y.
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Results for "departments_tesim:"Department of Physics""
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Fall 2017
Ultrafast terahertz (THz) microscopy is an emerging field of research that leverages the imaging of picosecond electric field transients to explore free carrier responses from a near-field perspective. This thesis presents the first effort made to use an electro-optic imaging system to probe the...
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Fall 2013
The main purpose of this thesis is to develop terahertz (THz) generation, detection, and spectroscopy techniques via ultrafast imaging methods. Sampling THz pulse waveforms with anoncollinear imaging technique was carried out. Full-field images of the THz electric field waveforms sampled in...
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Fall 2019
Narreto, Mary Alvean Balmadres
In this thesis, the ultrafast photoluminescence and photoconductivity dynamics of different types of semiconductors are investigated. Using time-resolved photoluminescence and time-resolved terahertz spectroscopy techniques, the origin of the light emission and the nature of carrier transport are...
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Fall 2015
Ultrafast carrier dynamics in silicon nanocrystals (Si NCs) is explored using time-integrated photoluminescence, time-resolved photoluminescence and pump-probe transient absorption spectroscopies. The role of surface oxygen in the optical emission dynamics of dodecyl functionalized Si NCs is...
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Fall 2021
Ultrafast terahertz (THz) spectroscopy is presently the most powerful tool available to materials scientists for directly probing ultrafast conductivity dynamics. Its low center frequency and phase-resolved measurement, which yields sub-picosecond temporal resolution, make it ideally suited for...
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Fall 2013
Terahertz spectroscopy is a powerful non-contact technique to study the optical and electric properties of materials at sub-picosecond time scales. In this study, ultrafast time-resolved terahertz spectroscopy was performed on both silicon-on-sapphire (SOS) and iron pyrite (FeS2) nano-crystalline...
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Fall 2011
Positronium consists of an electron and positron in a bound state, a purely leptonic system and therefore an excellent test of QED (quantum electrodynamics). The ground state is characterized by two different spin configurations: spin-singlet and spin-triplet states. The difference between the...