Instrumentation, Techniques, and Measurement

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

[+] Author Affiliations
James C. Gladish

Tektronix Inc., 13725 Southwest Karl Braun Drive, Beaverton, Oregon 97077, United States

Donald D. Duncan

Portland State University, Department of Electrical and Computer Engineering, 1900 Southwest 4th Avenue, Suite 160, Portland, Oregon 97201, United States

Opt. Eng. 55(5), 054104 (May 10, 2016). doi:10.1117/1.OE.55.5.054104
History: Received February 15, 2016; Accepted April 14, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

James C. Gladish and Donald D. Duncan
"Parameterizing liquid crystal variable retarder structural organization with a fractal-Born approximation model", Opt. Eng. 55(5), 054104 (May 10, 2016). ; http://dx.doi.org/10.1117/1.OE.55.5.054104


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