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Transparent thin-film characterization by using differential optical sectioning interference microscopy.

Chun-Chieh Wang1, Jiunn-Yuan Lin, Hung-Jhang Jian

  • 1Graduate Institute of Physics, National Chung Cheng University, Chia-Yi, Taiwan.

Applied Optics
|October 24, 2007
PubMed
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We developed differential optical sectioning interference microscopy (DOSIM) to measure refractive index and thickness of transparent thin films. This technique achieves submicrometer resolution without phase ambiguity.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Accurate characterization of transparent thin films is crucial for optical devices.
  • Existing methods often face limitations in resolution, accuracy, or ambiguity.

Purpose of the Study:

  • To introduce a novel optical thin-film characterization technique, differential optical sectioning interference microscopy (DOSIM).
  • To simultaneously measure refractive indices and thicknesses of transparent thin films with high lateral resolution.

Main Methods:

  • Differential optical sectioning microscopy combined with the Fabry-Perot interferometric effect.
  • Utilized a dual-scan concept to obtain depth and optical phase information.
  • Employed a microscope objective as the probe for diffraction-limited lateral resolution.

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Main Results:

  • Successfully measured refractive indices and thicknesses of SiO2 and indium-tin-oxide thin films.
  • Achieved submicrometer lateral resolution in thin-film characterization.
  • Resolved the 2pi phase-wrapping ambiguity inherent in other methods.

Conclusions:

  • DOSIM offers a robust method for simultaneous refractive index and thickness measurement of transparent thin films.
  • The technique demonstrates high accuracy and resolution, comparable to conventional methods.
  • DOSIM provides a valuable tool for materials science and nanotechnology applications.