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Optical Engineering

Parameterizing liquid crystal variable retarder structural organization with a fractal-Born approximation model
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Paper Abstract

Liquid crystal variable retarders (LCVRs) are computer-controlled birefringent devices that contain nanometer-sized birefringent liquid crystals (LCs). These devices impart retardance effects through a global, uniform orientation change of the LCs, which is based on a user-defined drive voltage input. In other words, the LC structural organization dictates the device functionality. The LC structural organization also produces a spectral scatter component which exhibits an inverse power law dependence. We investigate LC structural organization by measuring the voltage-dependent LC spectral scattering signature with an integrating sphere and then relate this observable to a fractal-Born model based on the Born approximation and a Von Kármán spectrum. We obtain LCVR light scattering spectra at various drive voltages (i.e., different LC orientations) and then parameterize LCVR structural organization with voltage-dependent correlation lengths. The results can aid in determining performance characteristics of systems using LCVRs and can provide insight into interpreting structural organization measurements.

Paper Details

Date Published: 10 May 2016
PDF: 8 pages
Opt. Eng. 55(5) 054104 doi: 10.1117/1.OE.55.5.054104
Published in: Optical Engineering Volume 55, Issue 5
Show Author Affiliations
James C. Gladish, Tektronix, Inc. (United States)
Donald D. Duncan, Portland State Univ. (United States)

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