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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 16 — Jun. 1, 2008
  • pp: 3002–3008

Effect of the number of sublayers on axial optics of anisotropic helical structures

I. Abdulhalim  »View Author Affiliations


Applied Optics, Vol. 47, Issue 16, pp. 3002-3008 (2008)
http://dx.doi.org/10.1364/AO.47.003002


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Abstract

The transition from the continuously rotating dielectric ellipsoid approach to the discrete periodic collection of wave plates is investigated by comparing an exact analytic solution found using a Bloch–Lyaponov transformation on the 4 × 4 matrix form of Maxwell’s equations and the numerical solution. The validity of the analytic solution depends only on the number of sublayers within the unit cell and not on the number of periods in the sample. The circularly polarized Bragg-type selective reflection peak is shown to exist with helices containing as few as N l = 3 sublayers in a single period, but due to the appearance of higher Fourier harmonics in the dielectric tensor, additional selective reflection peaks appear. The case of N l = 4 corresponds to the folded Solc-type filter case with a twist angle of π / 4 , but it acts as a reflection filter for unpolarized light. Hence using this fact with liquid crystalline structures, polarization insensitive tunable filters can be built.

© 2008 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics

ToC Category:
Physical Optics

History
Original Manuscript: February 25, 2008
Manuscript Accepted: March 26, 2008
Published: May 22, 2008

Citation
I. Abdulhalim, "Effect of the number of sublayers on axial optics of anisotropic helical structures," Appl. Opt. 47, 3002-3008 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-16-3002


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