Nonlinear switching of near infrared light in liquid crystal on silicon channel waveguides

d'Alessandro, Antonio and Asquini , Rita and Trotta, Marco and Beccherelli, Romeo (2010) Nonlinear switching of near infrared light in liquid crystal on silicon channel waveguides. In: Liquid crystals. SPIE. ISBN 9780819482716

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This paper reports on linear and nonlinear optical properties of channel waveguides made of micromachined SiO2/Si Vgrooves filled with nematic liquid crystal E7. Experiments demonstrate operation of the waveguides in the C-band (1530 – 1565 nm). Molecular reorientation of the NLC, induced either by an applied low frequency electric field or by the electric field of the light itself, changes the LC refractive index distribution then allowing the control of guided light. Design criteria and techniques of channel waveguides for both electro-optical and all-optical switching and modulation will be discussed. Experiments are presented where it is showed that light at 1550 nm, fiber-coupled to the LC waveguide is optically modulated by an optical beam with an input power below 25 mW. All-optical switching of a signal at 1510 nm with a contrast over 10 dB is also demonstrated by using a copropagating control signal at 1560 nm. A model of the waveguide is also presented able to explain linear and nonlinear experimental results.

Item Type: Book Section
Subjects: 600 Tecnologia - Scienze applicate > 620 Ingegneria e attivita' affini
Depositing User: Matteo Viola
Date Deposited: 12 Mar 2013 15:27
Last Modified: 19 Mar 2013 09:21

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