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Video-rate optical low-coherence reflectometry based on a linear smart detector array.

S Bourquin, V Monterosso, P Seitz

    Optics Letters
    |December 7, 2007
    PubMed
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    A novel low-coherence reflectometer uses a silicon detector chip for parallel heterodyne detection. This system achieves high-resolution imaging at video rate, enabling precise surface profiling and thickness measurements.

    Area of Science:

    • Optical Metrology
    • Photonics
    • Semiconductor Device Technology

    Background:

    • Low-coherence interferometry is crucial for non-contact metrology.
    • Conventional systems often face limitations in speed and sensitivity.
    • Advancements in detector technology are key to improving performance.

    Purpose of the Study:

    • To present a novel low-coherence reflectometer.
    • To demonstrate parallel heterodyne detection using a silicon detector chip.
    • To evaluate imaging speed and sensitivity for metrology applications.

    Main Methods:

    • Implementation of a Michelson interferometer.
    • Integration of a novel silicon detector chip for parallel heterodyne detection.
    • Acquisition of cross-sectional images at video rate.

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    Main Results:

    • Achieved video-rate acquisition of 64x256 pixel images over a 1.92 mm x 1.3 mm area.
    • Demonstrated sensitivity close to the shot-noise limit.
    • Successfully applied the system for surface profiling and thickness measurements.

    Conclusions:

    • The developed low-coherence reflectometer offers high-speed, high-sensitivity imaging.
    • The novel silicon detector chip enables efficient parallel heterodyne detection.
    • The system is well-suited for demanding surface profiling and thickness measurement tasks.