Laser Propagation in Biaxial Liquid Crystal Polymers
Choate, Eric P.
MetadataShow full item record
We examine the propagation of a laser beam through a liquid crystal polymer (LCP) layer using the finite-difference time-domain (FDTD) method. Anchoring conditions on supporting glass plates induce an orientational structure in the LCP between the plates. The orientation can deflect energy away from the direction of propagation of the incident beam when the optical axis or major director of a uniaxial medium is neither parallel nor orthogonal to the incident beam. The maximum energy deflection occurs when the angle between the incident beam and the major director of the orientation is 45 degrees, but for spatially uniform orientations, polarization orthogonal to the plane containing the major director and the propagation direction is unaffected. We investigate how to overcome this by twisting the anchoring alignment on the plates with respect to each other to generate a helical structure in the orientation across the gap to deflect all polarizations. We also examine the difference between the commonly used Leslie-Ericksen theory for the LCP, which assumes a uniaxial orientation, and the more general Doi-Marrucci-Greco orientation tensor model, which allows for both biaxial structures and oblate defect phases.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Light propagation in biaxial nematic liquid crystal polymers using the finite-difference time-domain method Choate, Eric P.; Zhou, Hong (2011);We examine the propagation of electromagnetic waves across a liquid crystal polymer (LCP) domain using the finite-difference time-domain (FDTD) method. In the limit of perfect LCP alignment, the order parameter s approaches ...
Anchoring distortions coupled with plane Couette & Poiseuille flows of nematic polymers in viscous solvents: Morphology in molecular orientation, stress & flow Zhou, Hong; Forest, M. Gregory (2006-03);The aim of this work is to model and simulate processing-induced heterogeneity in rigid, rod-like nematic polymers in viscous solvents. We employ a mesoscopic orientation tensor model due to Doi, Marrucci and Greco which ...
Naval Postgraduate School Physics (2013);The Casimir Effect: The demonstration shows that traveling water waves carry momentum. Here is a container of liquid. It is ethyl alcohol with the dye flourescein so that the waves can be seen. Water works, too, but alcohol ...