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Efficient terahertz detection in a sheet cavity using a nonlinear optical parametric process.

Kyosuke Saito, Tadao Tanabe, Yutaka Oyama

    Applied Optics
    |July 21, 2015
    PubMed
    Summary

    We developed a Gallium Phosphide (GaP) sheet cavity for room-temperature terahertz (THz) wave detection. This nonlinear optical (NLO) method achieved 1% power conversion efficiency for THz to optical signal conversion.

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    Area of Science:

    • Terahertz (THz) photonics
    • Nonlinear optics (NLO)
    • Semiconductor device engineering

    Background:

    • Terahertz (THz) wave detection is crucial for various scientific and technological applications.
    • Existing THz detection methods often require cryogenic cooling or suffer from limited sensitivity.
    • Nonlinear optical (NLO) processes offer a promising route for efficient frequency conversion and detection.

    Purpose of the Study:

    • To design and simulate a novel Gallium Phosphide (GaP)-based sheet cavity structure for room-temperature THz wave detection.
    • To investigate the potential of using nonlinear optical parametric processes for efficient THz-to-optical signal conversion.
    • To evaluate the performance metrics, such as power conversion efficiency and noise equivalent power, of the proposed THz detector.

    Main Methods:

    • Design of a GaP-based sheet cavity structure incorporating a rectangular waveguide for THz wave confinement.
    • Simulation of the nonlinear optical parametric process for photonic conversion from THz to optical frequencies.
    • Analysis of pump enhancement within the cavity and THz wave confinement to optimize power conversion efficiency.
    • Estimation of the noise equivalent power (NEP) using an optical single-photon detector.

    Main Results:

    • Achieved a high power conversion efficiency of 1% for THz wave detection at 5 THz.
    • Demonstrated significant pump enhancement and strong THz wave confinement within the GaP waveguide.
    • Estimated a noise equivalent power (NEP) on the order of a few femtowatts per square root of Hertz (fW Hz(-1/2)).
    • The NEP was found to be superior to existing room-temperature detectors like bolometers and field-effect transistors.

    Conclusions:

    • The designed GaP-based sheet cavity structure enables efficient room-temperature THz wave detection via NLO parametric processes.
    • The device offers a promising pathway for sensitive THz sensing with a competitive NEP.
    • This approach advances THz photonics by providing a compact and efficient room-temperature detection solution.