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A non linear theory of acoustoelectric amplification in piezoelectric semiconductors
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Ogg, Niel R. (1969) A non linear theory of acoustoelectric amplification in piezoelectric semiconductors. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1732879~S1
Abstract
At the present time there is a great deal of interest in non-linear acoustoelectric phenomena in piezoelectric semiconduotors. The behaviour of acoustic gain in the large signal regime is fundamental to an understanding of these phenomena. In this work we develop a non-linear theory of acoustoelectric gain.
General expressions are derived for the dependence of acoustoelectric gain and current on the electron density distribution associated with an acoustic wave propagating through a piezoelectric semioonductor. The results are valid for nearly periodic travelling waves with arbitrary harmonic content. It is shown that the frequency of peak gain and the magnitude of the peak gain both tend to zero as the acoustic wave amplitude increases and the electrons bunch more strongly. These features agree qualitatively with experimental observations. A quantitative comparison of the predicted frequency shift at a given flux level agrees to within an order of magnitude with available experimental data.
A theory for the dependence of acoustic gain on the electric potential accompanying the acoustic wave is also given. Numerical computations using the theory again produce a reduction in the aooustio gain and the frequency of peak acoustic gain. These results are also in reasonable agreement with experimental data.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Library of Congress Subject Headings (LCSH): | Piezoelectric semiconductors, Acoustic surface waves, Nonlinear theories | ||||
| Official Date: | April 1969 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | Department of Physics | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | Butcher, Paul N.; McLean, T. P. | ||||
| Sponsors: | Great Britain. Ministry of Technology | ||||
| Extent: | 145 leaves. | ||||
| Language: | eng |
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