Graduate Thesis Or Dissertation

 

Linear and Nonlinear Optical Studies of Liquid Crystalline Materials Public Deposited

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https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/hq37vn60x
Abstract
  • The electro optical response of liquid crystalline materials while displaying anisotropic properties, has led to numerous optical applications. A retro-reflecting modulator for optical communication systems using a high numerical aperture objective lens and a planar aligned nematic liquid crystal electrooptic cell that tunes the optical path length in the liquid crystal layer as a function of applied voltage has been developed. The field-induced phase shift varies the dependence of liquid crystal layer reflectivity in angle of incidence θ. This dependence can be studied in-situ by performing positional scan, z, along the axis of symmetry of the lens scan, focusing the light with an aberrative lens such that angle of incidence depends on z and measuring the reflectivity in the far field. These data show that a low reflected state can be achieved when liquid crystal thickness such that destructive interference with paraxial angle of incidence with θ ≈ 0 and high field "hometropic" orientation.
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  • 2013
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  • 2019-11-16
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