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Related Experiment Video

Updated: Jul 29, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Highly sensitive multi-stage terahertz parametric upconversion detection based on a KTiOPO4 crystal.

Yuye Wang, Changhao Hu, Chao Yan

    Optics Letters
    |May 23, 2023
    PubMed
    Summary

    This study presents a sensitive terahertz (THz) detector using KTP crystals and laser pumping. It achieves rapid detection and high sensitivity for THz waves, enabling broad frequency range measurements.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Technology
    • Nonlinear Optics

    Background:

    • Terahertz (THz) wave detection is crucial for various scientific and technological applications.
    • Existing THz detectors often face limitations in sensitivity, response speed, or frequency range.
    • Parametric upconversion offers a promising route for sensitive THz detection.

    Purpose of the Study:

    • To develop a highly sensitive multi-stage terahertz (THz) wave parametric upconversion detector.
    • To achieve rapid-response detection within specific THz frequency bands.
    • To demonstrate the capability for simultaneous detection of dual-color THz waves and broad frequency tunability.

    Main Methods:

    • Utilized a KTiOPO4 (KTP) crystal pumped by a 1064-nm pulsed laser for THz wave parametric upconversion.

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  • Employed stimulated polariton scattering for upconversion in a trapezoidal KTP crystal.
  • Implemented a multi-stage amplification process using two KTP crystals with non-collinear and collinear phase matching to enhance sensitivity.

    • Main Results:

    • Achieved rapid-response detection in the THz frequency ranges of 4.26-4.50 THz and 4.80-4.92 THz.
    • Demonstrated simultaneous detection of dual-color THz waves via dual-wavelength upconversion.
    • Realized a minimum detectable energy of 2.35 fJ with a dynamic range of 84 dB at 4.85 THz, yielding a noise equivalent power (NEP) of ~21.3 pW/Hz1/2.

    Conclusions:

    • The developed multi-stage THz parametric upconversion detector exhibits high sensitivity and rapid response.
    • The system shows potential for detecting a wide range of THz frequencies (approx. 1-14 THz) by adjusting phase-matching conditions or pump laser wavelength.
    • This technology advances THz sensing capabilities, opening avenues for improved THz imaging, spectroscopy, and communication systems.