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Wavelength-multiplexing surface plasmon holographic microscopy.

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    This study introduces an improved surface plasmon holographic microscopy (SPHM) using wavelength multiplexing. This technique enhances the measurement range and sensitivity for refractive index imaging, particularly for biological tissues.

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    Area of Science:

    • Optics and Photonics
    • Biophysics
    • Materials Science

    Background:

    • Surface plasmon resonance (SPR) imaging is crucial for label-free monitoring of refractive index changes.
    • Digital holographic microscopy (DHM) and surface plasmon microscopy (SPM) offer complementary imaging capabilities.
    • Existing SPR imaging techniques face limitations in measurement range and sensitivity for subtle refractive index variations.

    Purpose of the Study:

    • To develop an improved surface plasmon holographic microscopy (SPHM) system.
    • To enhance the quantitative monitoring of near-field dielectric refractive index variations.
    • To extend the measurement range and maintain high sensitivity in SPR imaging.

    Main Methods:

    • Implementation of a wavelength multiplexing technique using two laser sources.
    • Utilizing a common-path hologram recording configuration for improved stability.
    • Simultaneous recording and reconstruction of SPR images at two distinct wavelengths.

    Main Results:

    • Demonstrated quantitative monitoring of tiny dielectric refractive index variations with an extended measurement range.
    • Achieved high sensitivity in SPR imaging, even for low-contrast biological samples like onion tissues.
    • Showcased complementary detection sensitivities between the two wavelengths for enhanced imaging.

    Conclusions:

    • The proposed wavelength-multiplexing SPHM offers a simple, stable, and effective method for SPR imaging.
    • The technique provides inherent phase curvature compensation, improving image quality.
    • This advanced SPHM holds significant potential for dynamic refractive index monitoring and imaging biological tissues.