Terahertz wave detection using a low-temperature-grown GaAs photoconductive antenna excited by 1.5µm pulses

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  • KADOYA Yutaka
    Graduate School of Advanced Sciences of Matter, Hiroshima University

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Other Title
  • 1.5µm帯パルス光励起での低温成長GaAs光伝導アンテナによるテラヘルツ波検出
  • 1.5 µ mタイ パルスコウレイキ デ ノ テイオン セイチョウ GaAs ヒカリデンドウ アンテナ ニ ヨル テラヘルツハ ケンシュツ

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Abstract

<p>Recently, fiber lasers emanating femtosecond pulses at 1.5µm have been replacing the Ti:S lasers that were used for the generation and detection of THz waves in commercial time domain spectroscopy systems. To make the replacement efficient, it is necessary to develop a good photoconductive antenna that is excitable at 1.5µm. Though InGaAs-based antennas have been investigated and are commercially available now, the rather high noise level hampers the realization of a high signal-to-noise ratio. On the other hand, the excitation efficiency of low-temperature-grown (LTG) GaAs, which is suited for Ti:S lasers, is insufficient at 1.5µm. However, since the noise level of LTG GaAs antennas is very low, it can be an efficient antenna even for 1.5µm pulses, if one can improve its responsivity. One of the ways to accomplish this is to take advantage of the nonlinear absorption. In this article, we present our recent research on the excitation of LTG GaAs at 1.5µm.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 83 (7), 576-579, 2014-07-10

    The Japan Society of Applied Physics

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