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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 404–420

Multi-twist retarders: broadband retardation control using self-aligning reactive liquid crystal layers

Ravi K. Komanduri, Kristopher F. Lawler, and Michael J. Escuti  »View Author Affiliations


Optics Express, Vol. 21, Issue 1, pp. 404-420 (2013)
http://dx.doi.org/10.1364/OE.21.000404


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Abstract

We report on a family of complex birefringent elements, called Multi-Twist Retarders (MTRs), which offer remarkably effective control of broadband polarization transformation. MTRs consist of two or more twisted liquid crystal (LC) layers on a single substrate and with a single alignment layer. Importantly, subsequent LC layers are aligned directly by prior layers, allowing simple fabrication, achieving automatic layer registration, and resulting in a monolithic film with a continuously varying optic axis. In this work, we employ a numerical design method and focus on achromatic quarter- and half-wave MTRs. In just two or three layers, these have bandwidths and general behavior that matches or exceeds all traditional approaches using multiple homogenous retarders. We validate the concept by fabricating several quarter-wave retarders using a commercial polymerizeable LC, and show excellent achromaticity across bandwidths of 450–650 nm and 400–800 nm. Due to their simple fabrication and many degrees of freedom, MTRs are especially well suited for patterned achromatic retarders, and can easily achieve large bandwidth and/or low-variation of retardation within visible through infrared wavelengths.

© 2013 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(260.5430) Physical optics : Polarization
(310.0310) Thin films : Thin films
(310.4165) Thin films : Multilayer design
(310.6805) Thin films : Theory and design

ToC Category:
Thin Films

History
Original Manuscript: September 17, 2012
Revised Manuscript: November 30, 2012
Manuscript Accepted: December 3, 2012
Published: January 4, 2013

Citation
Ravi K. Komanduri, Kristopher F. Lawler, and Michael J. Escuti, "Multi-twist retarders: broadband retardation control using self-aligning reactive liquid crystal layers," Opt. Express 21, 404-420 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-1-404


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