Organic films for guided nonlinear optics

Year: 1998

Authors: Sottini S., Grando D., Palchetti L., Giorgetti E., Ricceri R., Gabrielli G.

Autors Affiliation: Ist. Ric. Onde Elettromagnetiche N., Consiglio Nazionale delle Ricerche, Via Panciatichi, 64, I-50127 Firenze, Italy; Dipartimento di Chimica, Università di Firenze, Firenze, Italy

Abstract: Nonlinear optics has recently developed from a purely basic discipline to a number of research fields focused on potential applications. One fundamental requirement is the implementation of future devices utilizing waveguides. Limiting us to organic materials, this demands the fabrication of homogeneous and hopefully oriented thin films. Here our activity on organic guides with interesting ?(2) or ?(3) nonlinear properties is reported. In particular, four layer guides (FLGs) including 2-docosylamino-5-nitropyridine (DCANP) Langmuir-Blodgett (LB) films have been realized and used to perform electro-optic tests. A measurement of the Pockel\’s r22 coefficient gave a value greater than 1 / 10 of the r33 coefficient of LiNbO3. In the case of ?(3) materials, both LB and spun films have been fabricated. In particular, LB films of poly-3BCMU show a higher degree of conjugation as proved by visible and resonance Raman spectra. This is a straightforward consequence of their ordered structure. In the case of spun films, the reduced conjugation is compensated by relatively easy fabrication and by guide losses as low as 3 dB cm-1 at 1300 nm. Devices based on tapered FLGs were realized to insert polymer films in glass integrated circuits. Moreover nonlinear tests performed by using the propagation at ? = 1064 nm gave a value of ?(3) = 3 × 10-19 m2 V-2.

Journal/Review: MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS

Volume: 5 (3-4)      Pages from: 167  to: 172

More Information: This work was carried out under European Project RACE 2012 and Italian Projects on MSTA and Telecommunications. The authors gratefully acknowledge M. Sparpaglione, ENIChem SpA, Italy, M. Licchelli and A. Faucitano, Univ. of Pavia, for the synthesis and polymerization of the 3BCMU and G.P. Banff, Univ. of Pavia, for the nonlinear tests.
KeyWords: Lithium compounds; Nonlinear optics; Organic polymers; Raman spectroscopy; Thin films; Waveguides, Film orientation; Organic films; Plastic optical fibres, Langmuir Blodgett films
DOI: 10.1016/S0928-4931(97)00037-4

Citations: 2
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