Carrier dynamics and terahertz radiation in large-aperture photoconductive antenna

Wei Shi; Xiao Fang Sun; Jun Zeng; Wan Li Jia

doi:10.1117/12.790953

22 February 2008 Carrier dynamics and terahertz radiation in large-aperture photoconductive antenna

Wei Shi, Xiao Fang Sun, Jun Zeng, Wan Li Jia

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 662228 (2008) https://doi.org/10.1117/12.790953
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

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.

Citation Download Citation

Wei Shi, Xiao Fang Sun, Jun Zeng, and Wan Li Jia "Carrier dynamics and terahertz radiation in large-aperture photoconductive antenna", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662228 (22 February 2008); https://doi.org/10.1117/12.790953

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