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Proceedings Paper

Carrier dynamics and terahertz radiation in large-aperture photoconductive antenna
Author(s): Wei Shi; Xiao Fang Sun; Jun Zeng; Wan Li Jia
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Paper Abstract

The Drude-Lorentz theory was used to calculate carrier transport in semi-insulating semiconductors when the biased band-engineered heterostructures photoconductive antennas with very short lifetimes radiating terahertz. But the conventional Drude-Lorentz theory was suitable for the small dipole aperture antennas, the calculations results indicated that when a biased photoconductive antenna is pumped by femtosecond laser pulses to generate THz radiation, a major portion of the THz radiation is due to the ultrafast change of the carrier density. So the new calculation model of THz radiation from large-aperture photoconductive antennas was reported, which took into account the interaction between electrons and holes, trapping of carriers in mid-gap states, scattering of carriers, dynamical space-charge effects, radiation field screening effect and gave a melioration of the calculation of carrier' density. Several simulation results and analysis of the effects of different factors of THz radiation based on new calculation results were shown, by which the new calculation model was proved more suitable for large-aperture antennas.

Paper Details

Date Published: 22 February 2008
PDF: 7 pages
Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662228 (22 February 2008); doi: 10.1117/12.790953
Show Author Affiliations
Wei Shi, Xi'an Univ. of Technology (China)
Xiao Fang Sun, Xi'an Univ. of Technology (China)
Jun Zeng, Xi'an Univ. of Technology (China)
Wan Li Jia, Xi'an Univ. of Technology (China)


Published in SPIE Proceedings Vol. 6622:
International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology

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