All-optical and thermal tuning of a bragg grating based on photosensitive composite structures containing liquid crystals

Gilardi, Giovanni and Asquini, Rita and d'Alessandro, Antonio and Beccherelli, Romeo and De Sio, Luciano and Umeton, Cesare (2012) All-optical and thermal tuning of a bragg grating based on photosensitive composite structures containing liquid crystals. Molecular Crystals and Liquid Crystals, 58. pp. 64-71. ISSN 1542-1406

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Abstract

We report on the fabrication and characterization of a tunable filtering effect, observed in a waveguide grating made of alternated strips of photocurable polymer and a mixture of azo-dye doped liquid crystal. The grating is sandwiched between two borosilicate glasses, one of which includes an ion-exchanged channel waveguide, which confines the optical signal to be filtered. We analyze the effects of a low power visible, pump light beam that hits the sample and temperature effects. Both effects are investigated experimentally. The application of the pump light allowing the filtered wavelength to be tuned over a 6.6 nm range, while a temperature variation of 4"C, implies a tuning of 14 nm.

Item Type: Article
Subjects: 600 Tecnologia - Scienze applicate > 620 Ingegneria e attivita' affini
Depositing User: Matteo Viola
Date Deposited: 12 Mar 2013 16:13
Last Modified: 21 Mar 2013 17:59
URI: http://eprints.bice.rm.cnr.it/id/eprint/4563

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