Title

Switchable Two-Dimensional Gratings Based on Field-Induced Layer Undulations in Cholesteric Liquid Crystals

Publication Title

Optics Letters

Publication Date

2-15-2005

Document Type

Article

DOI

10.1364/OL.30.000349

Disciplines

Physics

Abstract

We propose switchable two-dimensional (2D) diffractive gratings with periodic refractive-index modulation arising from layer undulations in cholesteric liquid crystals. The cholesteric cell can be switched between two states: (1) flat layers of a planar cholesteric texture and (2) a square lattice of periodic director modulation associated with layer undulations that produces 2D diffraction patterns. The intensities of the diffraction maxima can be tuned by changing the applied field. The diffractive properties can be optimized for different wavelengths by appropriately choosing cholesteric pitch, cell thickness, and surface treatment.

Comments

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA: http://dx.doi.org/10.1364/OL.30.000349

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