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Subwavelength-grating-induced wavefront aberrations: a case study.

Karlton Crabtree1, Russell A Chipman

  • 1College of Optical Sciences, University of Arizona, Tucson, AZ 85721-0094, USA. kcrabtree@optics.arizona.edu

Applied Optics
|July 5, 2007
PubMed
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This study analyzes wavefront aberrations in subwavelength-grating antireflection coatings for f/1.7 lenses. Results show minimal aberrations, with astigmatism and piston being the main contributors, impacting optical performance.

Area of Science:

  • Optics
  • Materials Science
  • Nanotechnology

Background:

  • Subwavelength-grating antireflection coatings offer advanced optical performance.
  • Understanding wavefront aberrations is crucial for lens system design.

Purpose of the Study:

  • To quantify on-axis wavefront aberrations in a 1D subwavelength-grating antireflection coating on an f/1.7 lens.
  • To analyze retardance aberrations and polarization coupling effects.

Main Methods:

  • Wavefront aberration analysis using optical metrology.
  • Characterization of defocus, astigmatism, piston, and retardance aberrations.
  • Polarization state coupling analysis.

Main Results:

  • On-axis aberrations are small, dominated by defocus, astigmatism (0.02 wave), and piston (approaching 1 wave).

Related Experiment Videos

  • Retardance aberrations include astigmatism-like (0.01 wave) and defocus-like (>0.01 wave) variations.
  • Polarization coupling is minimal (max 3%) in a Maltese cross pattern.

    • Conclusions:

    • The 1D subwavelength-grating antireflection coating exhibits low wavefront aberrations.
    • Retardance aberrations and polarization coupling are minor but present, requiring consideration in optical design.