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Applied Optics

Applied Optics


  • Vol. 40, Iss. 31 — Nov. 1, 2001
  • pp: 5731–5737

Stacked subwavelength gratings as circular polarization filters

Panfilo C. Deguzman and Gregory P. Nordin  »View Author Affiliations

Applied Optics, Vol. 40, Issue 31, pp. 5731-5737 (2001)

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We have stacked subwavelength gratings (SWGs) on a single substrate to create a compact, integrated circular polarization filter. The SWGs consist of a wire grid polarizer and a broadband form-birefringent quarter-wave plate (QWP). Rigorous coupled-wave analysis was used to design the QWP for operation over the 3.5–5.0-µm wavelength range. The fabricated silicon broadband QWP exhibited a phase retardance of 82–97° across this wavelength range. Two stacked structures are presented, each with a different wire grid polarizer fabricated on an organic planarization layer (SU-8) that is deposited on a QWP grating. Transmittance measurements of the first structure when illuminated with nominally right- and left-circularly polarized light indicate a circular extinction ratio (CER) limited by the low linear extinction ratio of the polarizer. Use of a wire grid polarizer with a higher extinct ratio led to a stacked SWG structure that demonstrated CERs of 10–45 across the 3.5–5.0-µm wavelength range.

© 2001 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.5440) Optical devices : Polarization-selective devices
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization

Original Manuscript: September 5, 2000
Revised Manuscript: June 8, 2001
Published: November 1, 2001

Panfilo C. Deguzman and Gregory P. Nordin, "Stacked subwavelength gratings as circular polarization filters," Appl. Opt. 40, 5731-5737 (2001)

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