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Continuous wave THz receivers with rhodium-doped InGaAs enabling 132 dB dynamic range.

Milan Deumer, Steffen Breuer, Shaffi Berrios

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    |November 22, 2024
    PubMed
    Summary
    This summary is machine-generated.

    We developed new terahertz detectors using rhodium-doped indium gallium arsenide (InGaAs). These detectors show 10x better performance than iron-doped versions, achieving a record dynamic range for terahertz spectroscopy.

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    Area of Science:

    • Terahertz (THz) Spectroscopy
    • Semiconductor Device Physics
    • Materials Science

    Background:

    • Photoconductive antennas are crucial for terahertz (THz) generation and detection.
    • Indium gallium arsenide (InGaAs) is a common material for these detectors.
    • Iron (Fe)-doped InGaAs has been widely used, but its performance has limitations.

    Purpose of the Study:

    • To develop novel, high-performance photoconductive terahertz detectors.
    • To investigate the potential of rhodium (Rh)-doped InGaAs for THz applications.
    • To compare the performance of Rh-doped InGaAs detectors against traditional Fe-doped InGaAs detectors.

    Main Methods:

    • Grown rhodium- (Rh) doped indium gallium arsenide (InGaAs) using molecular beam epitaxy.
    • Fabricated photoconductive antennas for continuous wave (cw) terahertz detection.
    • Utilized a homodyne spectrometer configuration for performance evaluation.
    • Measured responsivity, noise-equivalent-power (NEP), bandwidth, and dynamic range (DNR).

    Main Results:

    • Rh-doped InGaAs exhibits higher carrier mobilities compared to Fe-doped InGaAs, with similar carrier lifetimes.
    • The developed Rh-doped InGaAs photoconductive antennas demonstrate a 10-fold improvement in responsivity and NEP over InGaAs:Fe detectors.
    • A record peak dynamic range (DNR) of 132 dB was achieved, representing a 20 dB enhancement.

    Conclusions:

    • Rhodium-doped InGaAs is a superior material for photoconductive terahertz detectors compared to iron-doped InGaAs.
    • These new detectors offer significantly enhanced performance, particularly in responsivity and dynamic range.
    • The findings pave the way for more sensitive and advanced terahertz spectroscopy systems.