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Angular distribution of light scattered from a sinusoidal grating.

E Marx1, T A Germer, T V Vorburger

  • 1National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. egon.marx@nist.gov

Applied Optics
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PubMed
Summary
This summary is machine-generated.

Light scattering from gold and aluminum gratings was measured and compared to theoretical models. Experimental results showed higher-order peaks significantly larger than predicted, attributed to profile harmonics.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Surface Physics

Background:

  • Diffraction gratings are crucial optical components.
  • Accurate modeling of light scattering from gratings is essential for device design.
  • Surface topography significantly influences scattering patterns.

Purpose of the Study:

  • To experimentally measure and theoretically calculate the angular distributions of light scattered by gold and aluminum gratings.
  • To compare experimental scattering data with predictions from established theories, namely Beckmann's scalar theory and Rayleigh's vector theory.
  • To investigate the discrepancies between measured and calculated scattering patterns, particularly the power in higher-order peaks.

Main Methods:

  • Fabrication of gold-coated and aluminum-coated gratings with specific amplitudes (approx. 90 nm) and periods (6.67 microm).
  • Measurement of angular light scattering distributions using a He-Ne laser incident at a 6-degree angle.
  • Theoretical calculations based on Beckmann's scalar theory and Rayleigh's vector theory for comparison with experimental data.

Main Results:

  • Experimental angular scattering distributions were obtained for both gold and aluminum gratings.
  • A background of scattered light, attributed to surface roughness, was observed in the measurements.
  • The measured power in higher-order scattering peaks was several orders of magnitude greater than predicted by the theories.

Conclusions:

  • The significant discrepancy in higher-order peak intensities suggests limitations in current theoretical models for these gratings.
  • The increased power in higher-order peaks is primarily attributed to the contributions of harmonics within the grating profile.
  • Further refinement of scattering theories is needed to accurately account for the effects of surface profile details and harmonics.