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    Novel tools for ultrafast spectroscopy

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    JARVIS-DISSERTATION.pdf (18.07Mb)
    Date
    2011-12
    Author
    Jarvis, Thomas William
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    Abstract
    Exciton dynamics in semiconductor nanostructures are dominated by the effects of many-body physics. The application of coherent spectroscopic tools, such as two-dimensional Fourier transform spectroscopy (2dFTS), to the study of these systems can reveal signatures of these effects, and in combination with sophisticated theoretical modeling, can lead to more complete understanding of the behaviour of these systems. 2dFTS has previously been applied to the study of GaAs quantum well samples. In this thesis, we outline a precis of the technique before describing our own experiments using 2dFTS in a partially collinear geometry. This geometry has previously been used to study chemical systems, but we believe these experiments to be the first such performed on semiconductor samples. We extend this technique to a reflection mode 2dFTS experiment, which we believe to be the first such measurement. In order to extend the techniques of coherent spectroscopy to structured systems, we construct an experimental apparatus that permits us to control the beam geometry used to perform four-wave mixing reflection measurements. To isolate extremely weak signals from intense background fields, we extend a conventional lock-in detection scheme to one that treats the optical fields exciting the sample on an unequal footing. To the best of our knowledge, these measurements represent a novel spectroscopic tool that has not previously been described.
    Department
    Physics
    Description
    text
    Subject
    Spectroscopy
    Ultrafast spectroscopy
    Ultra-fast spectroscopy
    Exciton
    Exciton dynamics
    Exciton optics
    Excitons
    Four-wave mixing
    Four wave mixing
    GaAs
    Gallium Arsenide
    Quantum well
    Semiconductor
    Acousto-optic
    Acousto optic
    Acousto-optic modulation
    Agile frequency
    Direct digital synthesis
    Lock-in detection
    Lock in detection
    Two-dimensional
    Two dimensional
    Fourier transform
    Multi-dimensional
    Multi dimensional
    Coherent
    Dephasing
    Relaxation
    Many body
    Many-body
    Physics
    Correlation
    Plasmon
    Surface plasmon
    Polariton
    Surface
    Hybrid
    Coupling
    Mode
    Grating
    Nanostructure
    Nano-structure
    Nano structure
    Reflection
    Mode
    geometry
    Transmission
    Variable
    Angle
    tuning
    Tunable
    Tuned
    Angle-tuning
    Angle-tunable
    Beam
    controllable
    Control
    URI
    http://hdl.handle.net/2152/ETD-UT-2011-12-4456
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    • facebook
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    • CONTACT US
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    © The University of Texas at Austin