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Title page for ETD etd-03192010-154114


Type of Document Master's Thesis
Author Deepchand, Vimal
Author's Email Address v.deepchand@vanderbilt.edu
URN etd-03192010-154114
Title Characterization of the optical properties of gallium arsenide as a function of pump intensity using picosecond ultrasonics
Degree Master of Science
Department Physics
Advisory Committee
Advisor Name Title
Norman H. Tolk Committee Chair
Kalman Varga Committee Member
Keywords
  • GaAs
  • Coherent Acoustic Phonons
  • Pump-probe
  • picosecond ultrasonics
Date of Defense 2010-02-17
Availability unrestricted
Abstract
We report the observation of coherent acoustic phonon oscillations in GaSb(20 nm)/GaAs near the band gap of GaAs at room temperature. A photogenerated longitudinal acoustic phonon wave travels from the top surface of GaSb and into the GaAs substrate and gives rise to oscillations which provide useful information on the properties of GaAs as a function of depth and time. Using a time-resolved pump-probe technique, we investigate how the characteristics of the phonon oscillations change with intensity in the low-intensity regime near the band gap of GaAS and propose our technique as a method to quantify the optical properties of GaAs at room temperature.
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