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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Terahertz (THz) scattering-type scanning near-field optical microscopy (s-SNOM) typically requires cryogenic and bulky detectors, limiting practical applications.
    • Continuous wave sources are common in THz s-SNOM, but often face limitations in resolution and portability.

    Purpose of the Study:

    • To develop a compact and practical THz s-SNOM system with nanoscale spatial resolution.
    • To demonstrate amplitude and phase contrast imaging at THz frequencies.
    • To overcome the limitations of cryogenic detectors in current THz s-SNOM systems.

    Main Methods:

    • Utilized a quantum cascade laser (QCL) for simultaneous THz light emission and optical field sensing.
    • Implemented a self-mixing technique for voltage modulation and detection of the backscattered optical field.
    • Achieved nanoscale (60-70nm) in-plane spatial resolution.

    Main Results:

    • Successfully demonstrated a THz s-SNOM system providing both amplitude and phase contrast.
    • Achieved nanoscale spatial resolution of 60-70nm.
    • Probed phonon-polariton-resonant CsBr crystal and doped black phosphorus flakes to showcase system performance.

    Conclusions:

    • The developed THz s-SNOM system offers a practical alternative to bulky, cryogenic detector-based systems.
    • The self-mixing QCL technique enables high-resolution THz imaging without external detectors.
    • This advancement opens new avenues for nanoscale THz spectroscopy and material characterization.