Abstract
AbstractThe transmission of guided waves through a thin -film waveguide with an oriented liquid - crystal cladding of K18 exhibits, near the liquid - crystal nematic- isotropic phase transition, a number of all- optical operations, such as switching and bistability.IntroductionIn the area of nonlinear optics, liquid crystals have been attractive materials since they have one of the largest known intensity- dependent refractive indices due to both thermal effects (absorption) and molecular reorientation.' Many plane -wave, all- optical phenomena that dependon an intensity- dependent refractive index have been demonstrated using liquid crystals as the nonlinear medium.' Recently they have also proven to be useful for studying nonlinear effects in waveguides. The existence of nonlinear guided waves,' power- dependent transfer between twofiber waveguides,' and limiting action in a prism coupler° have all been demonstrated.The physics of the nematic -to- isotropic phase transition in a liquid crystal has also provento be very interesting. It has been shown that the optical, electrical, and elastic properties of
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