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Study on Terahertz Emission Properties of Small-Aperture Photoconductive Antenna

Author: HuangZhen
Tutor: ZhaoGuoZhong
School: Capital Normal University
Course: Optics
Keywords: Small aperture photoconductive antenna Terahertz wave Emission spectra Time-domain spectroscopy measurements
CLC: TN822
Type: Master's thesis
Year: 2009
Downloads: 50
Quote: 0
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Abstract


Terahertz (THz) radiation usually refers to the frequency of an electromagnetic wave in 0.1 THz to 10 THz, and its frequency is located between the microwave and infrared, is a far-infrared band. Over the last decade, the rapid development of terahertz wave generation. Small aperture photoconductive antenna is a small terahertz pulse emitter, which is based on the femtosecond laser excitation radiation of the terahertz wave. The papers by their own design photoconductive antenna, and the experimental measurements and analysis, the purpose is to optimize the system structure, improve small-aperture photoconductive antenna terahertz radiation performance. This paper details the production process of the photoconductive antenna, and produced several different electrode geometry photoconductive antennas of different semiconductor materials. We use terahertz time-domain spectroscopy, measuring the photoconductive antenna radiation terahertz pulse, the emission spectrum of the time-domain and frequency domain by fast Fourier transform spectroscopy. The results show that the photoconductive antenna radiation THz signal strength with the decrease in diameter of the pump laser spot is enhanced, is enhanced with increasing bias voltage, with increasing pump laser power of the first enhanced saturated phenomenon. Bias voltage, pump laser spot diameter pump laser power at the same time, we compare four photoconductive antenna generated THz signal found, butterfly photoconductive antenna radiation THz signal strength and frequency domain spectrum semi Maximum Total width (FWHM) is wider. On the basis of the previous experiments, we have further conducted on the small aperture butterfly photoconductive antenna. The results show that: the smaller the electrode spacing, the electrode angle, the stronger the smaller the emitted THz photoconductive antenna signal. Second, we have produced two butterfly-type geometry, different substrate materials cryogenic gallium arsenide (LT-GaAs), and a semi-insulating gallium arsenide (SI-GaAs) of the small aperture photoconductive antenna, the experimental results show that, using the LT- THz radiation performance GaAs photoconductive antenna production launch. In short, this article is more fully explore small aperture photoconductive antenna production method, a systematic study of the emission properties of the different experimental parameters small aperture photoconductive antenna, and comparative study of different electrode geometry under the same experimental parameters and The substrate material of the smaller aperture photoconductive antenna emission properties, summarizes the optimized design of the small aperture photoconductive antenna. This work can be used as the basis and reference for related research and application work.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: the band and the wave mode of transmission points
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