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Title page for ETD etd-03272017-101528


Type of Document Dissertation
Author Garnett, Joy Carleen
Author's Email Address joy.garnett@vanderbilt.edu
URN etd-03272017-101528
Title The Evolution of Surface Symmetry in Femtosecond Laser-Induced Transient States of Matter
Degree PhD
Department Interdisciplinary Materials Science
Advisory Committee
Advisor Name Title
Norman H. Tolk, Ph.D. Committee Chair
Jim Davidson, Ph.D. Committee Co-Chair
David J. Ernst, Ph.D. Committee Member
Kalman Varga, Ph.D. Committee Member
Timothy P. Hanusa, Ph.D. Committee Member
Keywords
  • ultrafast spectroscopy
  • femtosecond
  • second harmonic generation
  • nonlinear optics
  • nonlinear spectroscopy
Date of Defense 2017-03-14
Availability unrestricted
Abstract
Gallium arsenide and other III-V materials are well known for their excellent optical and electronic properties and have led to the development of high-performance optoelectronics. Several combinations of III-V semiconductors are now being considered as potentially attractive alternatives to silicon for these applications. However, further development requires fundamental understanding of processes that govern light-matter interactions. Specifically, surface strain and ultrafast dynamics are of great interest to the optoelectronic industry.

The research of this dissertation represents an initial exploration of the factors influencing nonlinear optical responses on semiconductor surfaces. The results of this research have the potential to inform the field of nonlinear optics about which lattice behaviors are most likely to contribute to static and transient second harmonic generation (SHG). This information allows for future work to focus on the connection between SHG, dipole contributions, and interatomic potentials in semiconductors under different conditions. This research also provides information about whether strain, resonances, and subpicosecond lattice behaviors can be fit with a simple analytical solution. The results of this research reveal that an analytical fit of polarization-resolved SHG is sensitive to interatomic potential and dipole variations in all three dimensions simultaneously.

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