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Aperture-coded confocal profilometry.

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    This study presents a new confocal profilometry method for simultaneously measuring surface position and tilt. It uses angle-dependent illumination coding to analyze reflected light, enabling precise surface characterization.

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    Area of Science:

    • Optics and Photonics
    • Surface Metrology
    • Nanotechnology

    Background:

    • Confocal profilometry is a key technique for surface characterization.
    • Accurate measurement of both surface position and tilt is crucial in various scientific and industrial applications.
    • Existing methods often face limitations in simultaneously capturing both parameters with high precision.

    Purpose of the Study:

    • To introduce a novel principle for confocal profilometry enabling simultaneous measurement of surface position and tilt.
    • To demonstrate an angle-dependent illumination coding strategy for enhanced surface analysis.
    • To provide a foundation for advanced surface metrology techniques.

    Main Methods:

    • Utilizing an angle-dependent coding of illumination by dividing the pupil into subapertures.
    • Decoding reflected light to perform angle-resolved analysis by measuring intensity contributions from each subaperture.
    • Employing wavelength division encoding for subaperture coding in the experimental demonstration.

    Main Results:

    • Successful demonstration of simultaneous surface position and tilt measurement.
    • Inference of surface tilt information by comparing intensity contributions from different subapertures.
    • Validation of the angle-dependent coding principle for enhanced profilometry.

    Conclusions:

    • The novel principle offers a significant advancement in confocal profilometry.
    • The developed method allows for simultaneous and precise measurement of surface position and tilt.
    • Future work can explore alternative coding schemes like temporal or code division encoding.