title: Optical monitoring of anchoring change in vertically aligned thin liquid crystal film for chemical and biological sensor.
abstract: A significant advance in sensitivity of liquid-crystal (LC)-based chemical and biological sensors can be achieved by actively monitoring anchoring energy change. We simulate the deformation of a LC director with different anchoring energies using the finite element method and the optical properties of the LC film using the finite-difference time-domain method. Polarizing micrographs are collected and compared with simulated textures. Measurement of optical transmission is used to monitor the anchoring change. Experimental and simulation results both demonstrate the optical method can effectively monitor the surface anchoring change due to the presence of targeted analytes.
authors.affiliation: Department of Electrical and Computer Engineering, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zou
authors.forename: Jun
authors.initials: J
authors.lastname: Namkung
authors.forename: Yongbin
authors.initials: Y
authors.lastname: Lin
authors.forename: Robert
authors.initials: R
authors.lastname: Lindquist
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000706:statistics & numerical data; D050866:Liquid Crystals; D055096:Optical Devices; D013499:Surface Properties; D013816:Thermodynamics