Graded index planar waveguides have been realized by using a nematic liquid crystal in a distorted hybrid configuration. The application of external electric fields enables to modify the orientation of the local molecular axis and hence to reshape in an easy and controlled way the refractive index profile. The waveguide, characterized for various electric field strengths by means of m-lines spectroscopy, behaves in good agreement with what expected from a simple model based on the dielectric, optical and elastic properties of the liquid crystal.
Reshaping of the refractive index profile of a liquid crystal waveguide by means of an external electric field / R. Ramponi, R. Osellame, M. Marangoni, M. Buscaglia, T. Bellini (PROCEEDINGS OF SPIE, THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING). - In: Congress of the International Commission for Optics: Optics for the Quality of Life / [a cura di] G.C. Righini, A. Consortini. - [s.l] : SPIE, 2003. - ISBN 0819445967. - pp. 503-504 (( Intervento presentato al 19. convegno International Commission for Optics: Optics for the Quality of Life tenutosi a Firenze nel 2002 [10.1117/12.525546].
Reshaping of the refractive index profile of a liquid crystal waveguide by means of an external electric field
M. Buscaglia;T. Bellini
2003
Abstract
Graded index planar waveguides have been realized by using a nematic liquid crystal in a distorted hybrid configuration. The application of external electric fields enables to modify the orientation of the local molecular axis and hence to reshape in an easy and controlled way the refractive index profile. The waveguide, characterized for various electric field strengths by means of m-lines spectroscopy, behaves in good agreement with what expected from a simple model based on the dielectric, optical and elastic properties of the liquid crystal.
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