Erasable holographic storage in azobenzene polyesters and peptides

P. S. Ramanujam; N. C. R. Holme; L. Nikolova; Rolf H. Berg; Soeren Hvilsted; Erik T. Kristensen; C. Kulinna; A. B. Nielsen; M. Pedersen

doi:10.1117/12.271362

10 April 1997 Erasable holographic storage in azobenzene polyesters and peptides

P. S. Ramanujam, N. C. R. Holme, L. Nikolova, Rolf H. Berg, Soeren Hvilsted, Erik T. Kristensen, C. Kulinna, A. B. Nielsen, M. Pedersen

Author Affiliations +

Proceedings Volume 3011, Practical Holography XI and Holographic Materials III; (1997) https://doi.org/10.1117/12.271362
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

We describe novel organic compounds based on polyester and peptide backbones with azobenzenes in the side chain for erasable holographic storage. These materials exhibit high diffraction efficiency, high resolution and long storage life and can be used for holographic storage in a broad spectra window of 415 - 530 nm. In polyester thin film systems with a chiral azobenzene, diffraction efficiencies of about 50% have been achieved with just 300 ms exposure. Through atomic force and near-field optical microscopic investigations, we have found an aggregation process encompassing both the main and side chains to be responsible for the permanent storage in the case of polyesters. The stored information can be erased globally in this case with heat. On the contrary, holograms written in peptide films are not totally erased even after exposure to 250 degree(s)C for one month. However, the information can be locally erased using circularly polarized light. A strong polarization dependent surface relief is observed both for the polyesters and peptides. Through FTIR and surface profile measurements, we further show that irradiation of the films with p- polarized light results in a large surface roughness. We show that in the case of the polyesters the storage is mostly due to optical anisotropy and in the case of the peptide oligomers, both the anisotropy and surface relief are large.

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P. S. Ramanujam, N. C. R. Holme, L. Nikolova, Rolf H. Berg, Soeren Hvilsted, Erik T. Kristensen, C. Kulinna, A. B. Nielsen, and M. Pedersen "Erasable holographic storage in azobenzene polyesters and peptides", Proc. SPIE 3011, Practical Holography XI and Holographic Materials III, (10 April 1997); https://doi.org/10.1117/12.271362

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