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Advances in Optics and Photonics

Advances in Optics and Photonics

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  • Editor: Govind Agrawal
  • Vol. 6, Iss. 2 — Jun. 30, 2014

The circular Bragg phenomenon

Muhammad Faryad and Akhlesh Lakhtakia  »View Author Affiliations


Advances in Optics and Photonics, Vol. 6, Issue 2, pp. 225-292 (2014)
http://dx.doi.org/10.1364/AOP.6.000225


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Abstract

Exhibited by structurally chiral materials—such as Reusch piles, cholesteric liquid crystals (CLCs), and chiral sculptured thin films (STFs)—due to their helical nonhomogeneity along a fixed axis, the circular Bragg phenomenon is the almost total reflection of the incident light of the co-handed circular-polarization state but very little reflection of the incident light of the cross-handed circular-polarization state. Manifesting itself in spectral regimes that depend on the angle of incidence, the structural period, and the relative permittivity dyadic, the phenomenon amounts to the formation of a light pipe that bleeds energy backward under appropriate conditions. Mild dissipation and dispersion do not significantly affect the circular Bragg regime. Every structurally chiral material of sufficient thickness is essentially a circular-polarization-sensitive band-rejection filter. Cascades of these materials with or without structural defects can be used to satisfy complex filtering requirements, such as multiband, narrowband, and ultra-narrowband filtering. A shift in the circular Bragg regime due to infiltration of a chiral STF by a fluid enables optical sensing. Sources of circularly polarized light can be fabricated by embedding emission sources in CLCs and chiral STFs.

© 2014 Optical Society of America

OCIS Codes
(120.2440) Instrumentation, measurement, and metrology : Filters
(160.3710) Materials : Liquid crystals
(230.1480) Optical devices : Bragg reflectors

ToC Category:
Optical Devices

History
Original Manuscript: January 2, 2014
Revised Manuscript: April 15, 2014
Manuscript Accepted: April 16, 2014
Published: June 5, 2014

Virtual Issues
(2014) Advances in Optics and Photonics

Citation
Muhammad Faryad and Akhlesh Lakhtakia, "The circular Bragg phenomenon," Adv. Opt. Photon. 6, 225-292 (2014)
http://www.opticsinfobase.org/aop/abstract.cfm?URI=aop-6-2-225

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