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Study of dynamic pressure-induced refractive index change using derivative total reflection method.

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    We measured how tissue

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    Area of Science:

    • Biomedical Optics
    • Tissue Mechanics
    • Optical Properties of Tissues

    Background:

    • Understanding how tissue optical properties change under mechanical stress is crucial for biomedical applications.
    • Mechanical compression can alter tissue structure and, consequently, its optical behavior.

    Purpose of the Study:

    • To quantify the dynamic change in the refractive index (RI) of biotissue.
    • To investigate tissue optical property alterations under controlled mechanical loading.

    Main Methods:

    • Utilized a custom-built pressure apparatus to apply stepped compression loads to biotissue samples.
    • Recorded angle-dependent reflectance profiles to analyze light interaction with the compressed tissue.
    • Employed the derivative total reflection method to accurately resolve refractive index values.

    Main Results:

    • Observed dynamic changes in the refractive index of biotissue in response to compression.
    • Quantified the relationship between applied mechanical load and refractive index variation.
    • Demonstrated the feasibility of measuring RI changes under mechanical stress.

    Conclusions:

    • The study provides key insights into the mechanical optical clearing phenomenon.
    • Findings are valuable for understanding tissue biomechanics and optical responses.
    • Results support advancements in optical methods for tissue characterization and medical diagnostics.