Título
Liquid crystal reorientation induced by photoisomerization and its applications in image processing
Autor
ROSARIO GUADALUPE PORRAS AGUILAR
Colaborador
RUBEN RAMOS GARCIA (Asesor de tesis)
JULIO CESAR RAMIREZ SAN JUAN (Asesor de tesis)
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
Dye doped liquid crystals are interesting materials which present a colossal optical nonlinearity (n2 = 103cm2=W). This dissertation is focused on the effects that contribute to the reorientation of the liquid crystal molecules induced by the dye photoanchoring to the substrate, and which are responsible for the formation of permanent gratings. It was found that small changes in the substrate due to the dye anchoring, leads to large changes in the bulk liquid crystal reorientation. In addition, the outstanding characteristics of this material, which include low power illumination requirements, amongothers, are exploited in phase contrast microscopy. An inversion in the image contrast of aknown phase object has been observed by changing the polarization from extraordinary to ordinary. Sofar, the minimum phase change resolvableis λ=8 at 633nm. This method can be implemented in realtime, and the contrast can be tuned by adjusting the intensity and polarization of the illumination beam, temperature and electricelds.
Editor
Instituto Nacional de Astrofísica, Óptica y Electrónica
Fecha de publicación
agosto de 2009
Tipo de publicación
Tesis de doctorado
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Porras-Aguilar R.G.
Repositorio Orígen
Repositorio Institucional del INAOE
Descargas
705