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Circular Dammann grating under high numerical aperture focusing.

Junjie Yu1, Changhe Zhou, Wei Jia

  • 1Lab of Information Optics and Optoelectronics Techniques, Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, P.O. Box 800-211, Shanghai 201800, China.

Applied Optics
|March 14, 2012
PubMed
Summary

Circular Dammann gratings (CDGs) create wavelength-scale patterns with subwavelength dark rings using high numerical aperture focusing. Fabricated CDGs match simulations, enabling applications in optical trapping and microscopy.

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Area of Science:

  • Optics and Photonics
  • Diffraction Theory
  • Nanophotonics

Background:

  • High numerical aperture (NA) focusing is crucial for subwavelength optical patterns.
  • Circular Dammann gratings (CDGs) offer precise control over light intensity distributions.
  • Vectorial diffraction theory is essential for accurate modeling of focused light.

Purpose of the Study:

  • To theoretically describe and experimentally verify Circular Dammann gratings (CDGs) under high NA focusing.
  • To investigate the generation of wavelength-scale annular patterns with subwavelength features.
  • To explore potential applications of CDGs in advanced optical techniques.

Main Methods:

  • Application of Richards-Wolf vectorial diffraction theory for CDG analysis.
  • Numerical simulations of CDGs with NA=0.9 and circularly polarized laser illumination.
  • Fabrication of a binary pure-phase three-order CDG.
  • Experimental measurement of the intensity distribution on the focal plane.

Main Results:

  • CDGs produce wavelength-scale equal-intensity circular patterns.
  • Doughnut-shaped central spots and dark rings exhibit subwavelength widths.
  • Experimental results closely match theoretical simulations for a fabricated CDG.

Conclusions:

  • CDGs are effective in generating precise annular intensity patterns.
  • The fabricated CDG successfully produced a dark center with concentric bright rings.
  • These CDGs hold significant potential for applications in optical trapping, STED microscopy, and singular optics.