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Measurement and Analysis of Noise Spectra in Terahertz Wave Detection Utilizing Low-Temperature-Grown GaAs Photoconductive Antenna

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Abstract

Noise power spectral density (NPSD) in time domain terahertz (THz) wave detection systems utilizing GaAs-based photoconductive antennas (PCAs) was investigated quantitatively. The contributions of the PCA noise and the amplifier noises at the amplifier output depend strongly on the resistance of the PCA, the circuit parameters, and the frequency. The PCA has two types of noise: one can be modeled by the Johnson-Nyquist (thermal) noise for the PCA resistance, while the other has an NPSD inversely proportional to the frequency with its intensity dependent on the properties of the GaAs and the metallization. At a high frequency range ~ 100 kHz, voltage-type amplifier noise could appear if the cable capacitance between the PCA and the amplifier is large. As a result, a low-noise range tends to appear in the intermediate frequency range. In comparison with the PCAs with Ti/Au metallization, the PCAs with Pd/Ge/Ti/Au having lower contact resistance lead to lager influence of the Johnson-Nyquist noise at the output.

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Acknowledgments

Authors acknowledge Dr. Yoriko Tominaga for the support in molecular beam epitaxy growth.

Funding

This work was supported by JSPS KAKENHI Grant Number JP18K04980.

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Authors and Affiliations

  1. Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, 739-8530, Japan

    Masahiro Nitta, Ryota Nakamura & Yutaka Kadoya

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  1. Masahiro Nitta
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  2. Ryota Nakamura
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  3. Yutaka Kadoya
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Correspondence to Yutaka Kadoya.

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Nitta, M., Nakamura, R. & Kadoya, Y. Measurement and Analysis of Noise Spectra in Terahertz Wave Detection Utilizing Low-Temperature-Grown GaAs Photoconductive Antenna. J Infrared Milli Terahz Waves 40, 1150–1159 (2019). https://doi.org/10.1007/s10762-019-00633-w

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