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    Area of Science:

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

    Background:

    • Traditional optical microscopy is limited by the diffraction limit, restricting resolution.
    • Terahertz (THz) imaging offers unique capabilities for non-destructive analysis but often faces resolution challenges.
    • Combining classical optical techniques can potentially overcome existing limitations.

    Purpose of the Study:

    • To develop a continuous wave sub-wavelength terahertz (THz) imaging system.
    • To achieve spatial resolution beyond the diffraction limit at 703 GHz.
    • To demonstrate the system's effectiveness with a low-cost detector and diverse samples.

    Main Methods:

    • Integration of solid immersion microscopy with interferometric detection.
    • Development of a continuous wave terahertz (THz) imaging setup operating at 703 GHz.
    • Experimental validation using a pyroelectric detector and samples with varying contrast.

    Main Results:

    • Demonstration of sub-wavelength spatial resolution at 703 GHz.
    • Successful imaging of both high and low contrast samples.
    • Achieved resolution surpassing the conventional diffraction limit.

    Conclusions:

    • The developed THz imaging system effectively combines solid immersion microscopy and interferometric detection.
    • Sub-wavelength resolution is achievable at 703 GHz using this novel approach.
    • The system's performance with a low-cost detector indicates potential for practical applications.