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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 24, Iss. 10 — Oct. 1, 2007
  • pp: 3140–3149

Sidelobe suppression in chiral optical filters by apodization of the local form birefringence

Andy C. van Popta, Kevin R. van Popta, Jeremy C. Sit, and Michael J. Brett  »View Author Affiliations

JOSA A, Vol. 24, Issue 10, pp. 3140-3149 (2007)

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Chiral optical filters are characterized by circular Bragg effects, including the preferential reflection and transmission of circular polarization states. The selective response to circularly polarized light is caused by stratified birefringent plates twisted into a helical arrangement, as seen in cholesteric liquid crystals and columnar thin films produced by oblique-angle physical vapor deposition. A refinement of the latter, glancing angle deposition employs substrate rotation to control the optical anisotropy of columnar thin films, and was used in this study to suppress the reflection sidelobes of chiral optical filters by modulating the local birefringence of helically structured thin films using an apodization function. Both theoretical simulations based on Berreman formalism, and experimental results involving evaporated Ti O 2 thin films are presented and compared.

© 2007 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(220.1230) Optical design and fabrication : Apodization
(230.1480) Optical devices : Bragg reflectors
(230.5440) Optical devices : Polarization-selective devices
(260.1440) Physical optics : Birefringence
(310.1860) Thin films : Deposition and fabrication
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Optical Devices

Original Manuscript: October 13, 2006
Revised Manuscript: May 8, 2007
Manuscript Accepted: June 20, 2007
Published: September 13, 2007

Andy C. van Popta, Kevin R. van Popta, Jeremy C. Sit, and Michael J. Brett, "Sidelobe suppression in chiral optical filters by apodization of the local form birefringence," J. Opt. Soc. Am. A 24, 3140-3149 (2007)

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