Issue 30, 2008
From the journal:

Journal of Materials Chemistry

Influence of chelating agents on the photopolymerization of hybrid Ti-based waveguides

Xavier Le Guével,a   Christian Palazzesi,a   Paolo Prosposito,*a   Gioia Della Giustinab  and  Giovanna Brusatinb  

* Corresponding authors

a Dipartimento di Fisica, Università di Roma—Tor Vergata and INSTM, Via della Ricerca Scientifica 1, 00133 Rome, Italy
E-mail: prosposito@roma2.infn.it

b Dipartimento di Ingegneria Meccanica, Università di Padova and INSTM, Via Marzolo 9, 35131 Padova, Italy

Abstract

Sol–gel derived inorganic–organic hybrid materials (HYBRIMERs) have shown a great potential for planar and channel waveguides due to their high photosensitivity, low-cost processing and good suitability for doping. These materials have been synthesized with a high content of titanium (40%) and with three different chelating agents: acetylacetone, methacrylic acid and trifluoroacetic acid. The degree of photopolymerization of the methacrylate part changes with the nature of the chelating agent. Trifluoroacetic acid and methacrylic acid are the chelating agents showing the highest photopolymerization conversion. All coatings were crack free (thickness ∼1 μm), transparent in the visible spectra range with refractive indexes from 1.54 to 1.58. Simple confined structures based on trifluoroacetic acid with well-defined shapes, smooth surfaces (RMS = 0.28 nm) and good optical properties were synthesized. Straight and bent channel waveguides and beam splitters were patterned by UV exposure and wet etching, and light confinement effects into the different channel waveguides were shown.

Graphical abstract: Influence of chelating agents on the photopolymerization of hybrid Ti-based waveguides

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Article information

DOI
https://doi.org/10.1039/B802257G
Article type
Paper
Submitted
08 Feb 2008
Accepted
16 May 2008
First published
20 Jun 2008

J. Mater. Chem., 2008,18, 3556-3562

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Influence of chelating agents on the photopolymerization of hybrid Ti-based waveguides

X. Le Guével, C. Palazzesi, P. Prosposito, G. Della Giustina and G. Brusatin, J. Mater. Chem., 2008, 18, 3556 DOI: 10.1039/B802257G

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