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Proceedings Paper

Polarization-dependent nonlinear phase contrast by using dye-doped nematic liquid crystals
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Paper Abstract

Nonlinear phase contrast microscopy is an optical technique that uses an intensity-dependent refractive index material to produce high-contrasted images of transparent specimens. Earlier proposal of liquid crystals as phase filters for phase contrast applications used optically addressed spatial light modulators fabricated with photoconductive film. Here, we propose the use of a simpler planar nematic liquid crystal cell doped with 1% wt methyl red. Owing to their polarization dependent enhancement factor a tunable phase filter can be photoinduced efficiently. Thus, images of different degree of contrast (and even contrast reversal) can be obtained either by rotating the polarization vector. All optical real-time imaging of dynamic events can be performed and image processing such as edge enhancement is demonstrated.

Paper Details

Date Published: 27 August 2008
PDF: 7 pages
Proc. SPIE 7050, Liquid Crystals XII, 705006 (27 August 2008); doi: 10.1117/12.791556
Show Author Affiliations
Rosario Porras-Aguilar, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Marcelo D. Iturbe-Castillo, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Julio C. Ramirez-San-Juan, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Oscar Baldovino-Pantaleon, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
David Sanchez de la Llave, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Ruben Ramos-Garcia, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Luis Arroyo-Carrasco, Benemérita Univ. Autónoma de Puebla (Mexico)


Published in SPIE Proceedings Vol. 7050:
Liquid Crystals XII
Iam Choon Khoo, Editor(s)

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