1 Risø National Laboratory for Sustainable Energy, Technical University of Denmark2 The Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark3 Department of Chemical and Biochemical Engineering, Technical University of Denmark4 unknown5 Department of Micro- and Nanotechnology, Technical University of Denmark6 Department of Photonics Engineering, Technical University of Denmark
Photodimerization of chromophores attached to a short peptide chain is investigated for high-capacity optical digital storage with UV lasers. The length and rigidity of the peptide chain assure an optimal distance and orientation of the chromophores for effective photodimerization. Using a theory developed by Tomlinson, the absorption cross section for the dimerization process in a uracil-ornithine-based hexamer is determined to be 9 x 10(-20) cm(2). A large change in the transmission due to irradiation in the UV area may make it possible to realize multilevel storage in a thin film of the peptides.
Japanese Journal of Applied Physics, 2006, Vol 45, Issue 1B, p. 488-492