The emission and detection efficiencies of photoconducting THz transmitters and receivers are found to be sensitive to the polarization of the optical gating pulse. Signal amplitudes from GaAs coplanar stripline transmitters and silicon-on-sapphire dipole receivers vary by factors of up to 4 and 3, respectively, with rotation of the exciting pulse polarization. In both cases, maximum signal is obtained when the polarization of the normally incident light is perpendicular to the edge of the metal electrodes. This polarization sensitivity, which appears to arise from differences in the spatial distribution of photoexcited carriers in the semiconductor, needs to be considered when optimizing the signal-to-noise ratio in coherent THz spectroscopy.
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27 April 1998
Research Article|
April 27 1998
Polarization-dependent efficiency of photoconducting THz transmitters and receivers Available to Purchase
P. G. Huggard;
P. G. Huggard
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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C. J. Shaw;
C. J. Shaw
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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J. A. Cluff;
J. A. Cluff
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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S. R. Andrews
S. R. Andrews
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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P. G. Huggard
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
C. J. Shaw
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
J. A. Cluff
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
S. R. Andrews
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
Appl. Phys. Lett. 72, 2069–2071 (1998)
Article history
Received:
December 30 1997
Accepted:
February 25 1998
Citation
P. G. Huggard, C. J. Shaw, J. A. Cluff, S. R. Andrews; Polarization-dependent efficiency of photoconducting THz transmitters and receivers. Appl. Phys. Lett. 27 April 1998; 72 (17): 2069–2071. https://doi.org/10.1063/1.121278
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