Mr. Yongfang Liu Profile

Yongfang Liu

at Tianjin Univ

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Proceedings Article | 5 November 2020 Paper

Research on terahertz photoconductive antenna and its array

Yongfang Liu, Yongping Zhang

Proceedings Volume 11562, 115620C (2020) https://doi.org/10.1117/12.2575759

KEYWORDS: Antennas, Terahertz radiation, Silicon, Lens design, Signal to noise ratio, Pulsed laser operation, Principal component analysis, Picosecond phenomena, Electrodes, Amplifiers

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In this paper, the current generated by the photoconductive antenna was calculated using the Drude-Lorentz(DL) model. Influence of the structural parameters of SI-GaAs dipole antenna on the terahertz radiation characteristics was studied using CST Microwave Studio software. The results indicate that the length and width of the antenna are appropriately smaller, which can increase the radiated power. According to the simulation results, silicon-based antennas with radius of 0.5 mm, 1 mm and 1.5mm were designed, and the influence of the radius and extended length of the lens on the antenna performance was studied. The results indicate that when the radius is small, the lens antenna has a peak gain in the high frequency band, and the radiation spectrum bandwidth of the lens antenna will increase significantly. When the ratio of extended length to radius is 0.28, the directivity of the lens antenna is better, and the peak gain of 0.5-mm lens antenna is 26.1 dBi. A 2×2 dipole antenna array was designed. The radiated power of the array element is about 10 μW, and the signal-to-noise ratio of the array element is about 50 dB. The antenna array was tested using a terahertz time-domain spectroscopy system (THz-TDS). The results indicate that the peak value of the time domain waveform of the 2×1 array is about twice the peak value of the array element, and the superposition of the time domain waveform is achieved. The peak value of the time domain waveform of the 1×2 array is lower than the peak value of the array element. The radiated power of the 2×2 antenna array has increased in this design, and the peak value of the antenna array has increased by about 3.5 times.

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