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Proceedings Paper

Improving energetic sensitivity in holography with a new photopolymer containing a mixture of rose bengal and methylene blue
Author(s): Ricardo Marin Mallavia; Antonio Fimia; Celia Garcia; Roberto Sastre
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Paper Abstract

We present the results of the study as holographic recording material of aphotopolymerizable mixture of polyvinyl alcohol and acrylamide, with a photo initiator system formed by a 1:1 molar mixture of the anionic dye Rose Bengal (RB) and the cationic one Methylene Blue (MB), with triethanolamine as coinitiator. Under irradiation with 514 or 633 nm light and comparative conditions, photopolymers with this photo initiator system give rise to a clear sensitivity enhancement, with regard to the use of any of the dyes alone. Still higher enhancements were achieved using as absorbing component an isolated ion-pair from the 1:1 mixture of both dues, with some different properties than those of the physical 1:1 mixture of dyes. Maximum diffraction efficiencies of 35-64 percent with 30-100, and spatial resolution of ca. 1000, could be reached. The photo initiator mechanism using either the mixture RB/MB or the isolated ion-pair RB-MB is likely based on charge-transfer processes from the excited chromophores, that seems to be favored in the case of the ion-pair.

Paper Details

Date Published: 4 June 2001
PDF: 9 pages
Proc. SPIE 4296, Practical Holography XV and Holographic Materials VII, (4 June 2001); doi: 10.1117/12.429475
Show Author Affiliations
Ricardo Marin Mallavia, Univ. Miguel Hernandez/Elche (Spain)
Antonio Fimia, Univ. Miguel Hernandez/Elche (Spain)
Celia Garcia, Univ. de Alicante (Spain)
Roberto Sastre, Instituto de Ciencia y Tecnologia de Polimeros (Spain)

Published in SPIE Proceedings Vol. 4296:
Practical Holography XV and Holographic Materials VII
Stephen A. Benton; Sylvia H. Stevenson; T. John Trout; Sylvia H. Stevenson; T. John Trout, Editor(s)

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