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Noninterferometric wide-field optical profilometry with nanometer depth resolution.

Chau-Hwang Lee, Hong-Yao Mong, Wan-Chen Lin

    Optics Letters
    |November 23, 2007
    PubMed
    Summary
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    We developed a novel optical profilometer using differential confocal microscopy principles for high-resolution surface measurements. This scanning-free system achieves 2 nm depth resolution, enabling accurate topographic mapping of diverse surfaces.

    Area of Science:

    • Optical Metrology
    • Microscopy Techniques
    • Surface Science

    Background:

    • Traditional optical profilometry often relies on scanning mechanisms, which can be slow and complex.
    • Achieving high depth resolution (nanometer scale) is crucial for detailed surface characterization.
    • Surface reflectivity variations can introduce significant errors in topographic measurements.

    Purpose of the Study:

    • To develop a non-interferometric optical profilometer without scanning mechanisms.
    • To achieve high depth resolution for precise surface topography measurements.
    • To compensate for inhomogeneous surface reflectivity in measurements.

    Main Methods:

    • Applied the principle of differential confocal microscopy to wide-field optically sectioning microscopy.

    Related Experiment Videos

  • Utilized a power-regulated tungsten-halogen lamp as the light source.
  • Employed a 14-bit CCD camera as the detector.
  • Removed effects of inhomogeneous surface reflectivity using arithmetic division.

    • Main Results:

    • Developed a scanning-free, non-interferometric optical profilometer.
    • Achieved a depth resolution of 2 nm.
    • Successfully removed surface reflectivity variations from topographic data.
    • Demonstrated the potential for miniaturization onto a single silicon chip.

    Conclusions:

    • The developed optical profilometer offers a high-resolution, scanning-free method for surface topography measurement.
    • The system effectively corrects for surface reflectivity, enhancing measurement accuracy.
    • The potential for chip-scale integration paves the way for miniaturized optical profiling applications.