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Proceedings Paper

Polarization twisted nematic gratings: a study of the far field diffraction pattern
Author(s): David Statman; Robert Pettit; John Stenger
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Paper Abstract

When left and right circularly polarized beams of light from a pump laser interfere in a nematic liquid crystal doped with azo dye, a polarization twisted nematic (PTN) grating is formed in the sample. The same is not true when linearly polarized light interferes, regardless of the polarization. For circularly polarized light, the easy axis is rotated toward the polarization direction of interfering beams. The irradiance is uniform so there is less contribution to refractive index variations. In the latter case the diffraction grating arises from variation in refractive index. Gratings written with Disperse Orange 3 (DO3) as the dopant disappear after removal of the pump beams, whereas grating written with Methyl Red (MR) as the dopant tend to be semi-permanent.

Paper Details

Date Published: 7 September 2011
PDF: 6 pages
Proc. SPIE 8114, Liquid Crystals XV, 811417 (7 September 2011); doi: 10.1117/12.894583
Show Author Affiliations
David Statman, Allegheny College (United States)
Robert Pettit, Allegheny College (United States)
John Stenger, Allegheny College (United States)


Published in SPIE Proceedings Vol. 8114:
Liquid Crystals XV
Iam Choon Khoo, Editor(s)

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