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Finite-aperture wire grid polarizers.

M A Jensen1, G P Nordin

  • 1Department of Electrical and Computer Engineering, Brigham Young University, Provo, Utah 84602, USA. jensen@ee.byu.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|January 5, 2001
PubMed
Summary

Finite aperture wire grid polarizers were studied. Aperture size significantly affects transmission and extinction, with scattering limiting performance in infrared applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Wire grid polarizers are crucial optical components.
  • Understanding their performance in finite apertures is key for advanced applications.

Purpose of the Study:

  • Investigate transmission characteristics of wire grid polarizers in finite apertures.
  • Analyze the impact of geometrical parameters on optical performance.

Main Methods:

  • Utilized a three-dimensional finite-difference time-domain (FDTD) formulation.
  • Characterized optical transmissivity and extinction ratio.
  • Employed a dispersive material model for realistic metal performance.

Main Results:

  • Aperture dimensions significantly influence polarizer transmission.
  • Extinction ratio is often limited by depolarizing scattering from finite apertures.
  • Performance was analyzed for various parameters like fill factor and thickness.

Conclusions:

  • Finite aperture size is a critical design factor for wire grid polarizers.
  • Scattering effects in finite apertures pose a challenge for high extinction ratios.
  • Results provide insights for optimizing polarizer design in infrared wavelengths.

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