Methacrylic azopolymers for holographic storage: A comparison among different polymer types |
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Authors: | Patricia Forcén Carlos Sánchez Rafael Alcalá Søren Hvilsted |
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Institution: | a Departamento de Química Orgánica, Facultad de Ciencias-Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain b Departamento de Física de la Materia Condensada, Facultad de Ciencias-Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain c Danish Polymer Centre, Department of Chemical Engineering, Technical University of Denmark, DK-2800 Kgs Lyngby, Denmark |
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Abstract: | The photoinduced anisotropy and volume holographic storage in a series of polymers with different architectures and azo contents of 7% and 20% in weight have been investigated. Measurements of the birefringence (Δn) induced with linearly polarised 488 nm light show that for polymers with an azo content of 20%, the highest and more stable Δn values are achieved in copolymers with a di-block architecture. The Δn induced in polymers with 7 wt% azo content is not stable. Volume holographic polarisation gratings have been stored in the polymers. Only in the case of the di-block copolymer with an azo content of 20% in weight, the stored gratings are stable. A diffraction efficiency higher than 90% and an angular selectivity of 4° have been achieved in gratings with a period of 2 μm. It can be concluded that the di-block copolymer with 20 wt% azo content is the most suitable, among the studied copolymers, as volume holographic storage material. |
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Keywords: | Azopolymer Block copolymer Holography Liquid crystal polymer |
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