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Related Experiment Videos

Evanescent imaging with induced polarization by using a solid immersion lens.

Tao Chen1, Tom D Milster, Seung-Hune Yang

  • 1College of Optical Sciences, University of Arizona, Tucson 85721, USA.

Optics Letters
|December 23, 2006
PubMed
Summary

Induced polarization evanescent imaging with a solid immersion lens achieves enhanced contrast and high resolution. This technique accurately maps surface topography, demonstrating +/-2 nm height accuracy for nanoscale imaging applications.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Surface Science

Background:

  • Traditional imaging techniques face limitations in achieving high resolution and quantitative topographical information simultaneously.
  • Evanescent wave imaging offers potential for sub-wavelength resolution but often struggles with contrast and direct height measurement.
  • Solid immersion lenses can enhance optical resolution by increasing the effective numerical aperture.

Purpose of the Study:

  • To demonstrate induced polarization evanescent imaging (IPE) using a solid immersion lens (SIL) for enhanced contrast and high lateral resolution.
  • To obtain quantitative height information from nanoscale surface features.
  • To validate the imaging technique's accuracy using a known sample.

Main Methods:

Related Experiment Videos

  • Utilizing induced polarization evanescent waves coupled through a solid immersion lens (NA=1.5) to image a patterned silicon substrate.
  • Applying imaging theory to determine optimal sample orientation for high-spatial-frequency features.
  • Deriving a topographical image from the induced polarization image via a calibration procedure.

    • Main Results:

    • Achieved significant image contrast enhancement and high lateral resolution.
    • Successfully obtained height information of surface features.
    • Demonstrated a height accuracy of +/-2 nm on a known sample, validating the technique's precision.

    Conclusions:

    • Induced polarization evanescent imaging combined with a solid immersion lens is a powerful technique for high-resolution, high-contrast imaging.
    • The method provides accurate topographical mapping with nanometer precision.
    • This approach holds promise for advanced nanoscale metrology and surface characterization.