Saturation and polarization characteristics of 1.56 μm Optical probe pulses in a LTG-GaAs photoconductive antenna terahertz detector

Saturation and polarization characteristics of 1.56 μm Optical probe pulses in a LTG-GaAs photoconductive antenna terahertz detector

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 polariza...

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Bibliographic Details
Main Authors: Estacio, Elmer S., Hibi, Masakazu, Saito, Katsuya, Que, Christopher T., Furuya, Takashi, Miyamaru, Fumiaki, Nishizawa, Seizi, Yamamoto, Kohji, Tani, Masahiko
Format: text
Published: Animo Repository 2013
Subjects:
Photoconductivity
Antennas (Electronics)
Gallium arsenide
Terahertz spectroscopy
Physics
Online Access:https://animorepository.dlsu.edu.ph/faculty_research/4033
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Institution: De La Salle University
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Summary: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. © 2013 Springer Science+Business Media New York.

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