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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 20 — Oct. 15, 2008
  • pp: 2287–2289

Achromatic diffraction from polarization gratings with high efficiency

Chulwoo Oh and Michael J. Escuti  »View Author Affiliations

Optics Letters, Vol. 33, Issue 20, pp. 2287-2289 (2008)

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We demonstrate a broadband, thin-film, polarizing beam splitter based on an anisotropic diffraction grating composed of reactive mesogens (polymerizable liquid crystals). This achromatic polarization grating (PG) manifests high diffraction efficiency ( 100 % ) and high extinction ratio ( 1000 : 1 ) in both theory and experiment. We show an operational bandwidth Δ λ λ 0 56 % (roughly spanning visible wavelength range) that represents more than a fourfold increase of bandwidth over conventional PGs (and significantly larger than any other grating). The diffraction angle and operational region (visible, near-infrared, midwave infrared, and ultraviolet wavelengths) may be easily tailored during fabrication. The essence of the achromatic design is a stack of two chiral PGs with an opposite twist sense and employs the principle of retardation compensation. We fully characterize its optical properties and derive the theoretical diffraction behavior.

© 2008 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(090.1970) Holography : Diffractive optics
(230.1360) Optical devices : Beam splitters
(260.5430) Physical optics : Polarization

ToC Category:
Diffraction and Gratings

Original Manuscript: April 23, 2008
Manuscript Accepted: June 30, 2008
Published: October 3, 2008

Chulwoo Oh and Michael J. Escuti, "Achromatic diffraction from polarization gratings with high efficiency," Opt. Lett. 33, 2287-2289 (2008)

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