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Saturation and Polarization Characteristics of 1.56 μm Optical Probe Pulses in a LTG-GaAs Photoconductive Antenna Terahertz Detector

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Abstract

The characteristics of low temperature-grown GaAs photoconductive antenna (PCA) terahertz detectors probed by 1.56 μm laser pulses are investigated. The influence of TM and TE polarized probe, as well as the saturation characteristics are studied for 2 μm- and 5 μm-gap PCA’s. Different polarization characteristics at low probe powers and at the saturation regimes were observed. Results are explained in terms of the polarization-dependent photocarrier distribution at the PCA gap arising from tight focusing. This work also demonstrates using a 1.56 μm probe for a GaAs PCA to achieve ~60 dB SNR; matching its performance characteristics for above-bandgap probes.

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Acknowledgments

This work was supported in part by a grant program from the Development of Systems and Technology for Advanced Measurement and Analysis, Japan Science and Technology Agency (JST), and also by a grant program from the Feasibility Study Stage in Adaptable and Seamless Technology transfer Program (FS-stage, A-STEP), JST.

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Authors and Affiliations

  1. Research Center for Development of Far-Infrared Region, University of Fukui, Fukui, 910-8507, Japan

    Elmer S. Estacio, Masakazu Hibi, Katsuya Saito, Christopher T. Que, Takashi Furuya, Kohji Yamamoto & Masahiko Tani

  2. Department of Physics, Faculty of Science, Shinshu University, Asahi 3-1-1, Matsumoto, Nagano, 390-8621, Japan

    Fumiaki Miyamaru

  3. Advanced Infrared Spectroscopy Co., Ltd., 3-17-16, Sennin, Hachioji, Tokyo, 193-0835, Japan

    Seizi Nishizawa

  4. National Institute of Physics, University of the Philippines, Diliman Quezon City, 1101, Philippines

    Elmer S. Estacio

  5. Physics Department, De La Salle University, 2401 Taft Avenue, Manila, 1004, Philippines

    Christopher T. Que

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  1. Elmer S. Estacio
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  2. Masakazu Hibi
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  3. Katsuya Saito
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  4. Christopher T. Que
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  5. Takashi Furuya
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  7. Seizi Nishizawa
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  8. Kohji Yamamoto
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  9. Masahiko Tani
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Correspondence to Elmer S. Estacio.

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Estacio, E.S., Hibi, M., Saito, K. et al. Saturation and Polarization Characteristics of 1.56 μm Optical Probe Pulses in a LTG-GaAs Photoconductive Antenna Terahertz Detector. J Infrared Milli Terahz Waves 34, 423–430 (2013). https://doi.org/10.1007/s10762-013-9977-3

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  • DOI: https://doi.org/10.1007/s10762-013-9977-3

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