THz radiation from 3-mm parallel gap GaAs photoconductive dipole antenna

Wei Shi; Wanli Jia; Lei Hou; Xianbin Zhang; Ming Xu; Xuegang Xu

doi:10.1117/12.577816

17 January 2005 THz radiation from 3-mm parallel gap GaAs photoconductive dipole antenna

Wei Shi, Wanli Jia, Lei Hou, Xianbin Zhang, Ming Xu, Xuegang Xu

Proceedings Volume 5644, Optoelectronic Devices and Integration; (2005) https://doi.org/10.1117/12.577816
Event: Photonics Asia, 2004, Beijing, China

Abstract

We report the experimental results of a large-aperture biased semi-insulating GaAs photoconductive dipole antenna, with a gap of 3 mm between two Au/Ge/Ni electrodes, triggered by 800 nm Ti-sapphire laser pulses with 82 MHz repetition rate. A direct comparison is made between insulated GaAs dipole antenna with a Si₃N₄ layer and bare GaAs dipole antenna. The radiation amplitude present linear to the exciting power when the applied voltage is fixed. The Si₃N₄ insulated GaAs dipole antenna can hold higher biased voltage than normal GaAs dipole antenna; its terahertz radiation generation efficiency is significantly higher than normal GaAs dipole antenna. The maximum voltage can be hold by the Si₃N₄ insulated GaAs dipole antenna is about 2 times higher than normal GaAs dipole antennas. We simulate the THz radiations from insulated GaAs dipole antenna with Si₃N₄ layer and bare GaAs dipole antenna. The waveforms of the simulated normalized surface field are in close agreement with the waveforms of the experimental results.

Citation Download Citation

Wei Shi, Wanli Jia, Lei Hou, Xianbin Zhang, Ming Xu, and Xuegang Xu "THz radiation from 3-mm parallel gap GaAs photoconductive dipole antenna", Proc. SPIE 5644, Optoelectronic Devices and Integration, (17 January 2005); https://doi.org/10.1117/12.577816

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