Abstract
Azobenzene oligomer layers with side chain chromofore groups (ChG) has been experimentally studied to optimize scalar and vector hologram recording at 633 nm. ChG with different acceptors (Br, NO2, H, CN) and different bonding type to the matrix (dispersed without bonding or with covalent bonding) were used. The influence of oligomer matrix (polyvinylbuthirol, tolyle, hexamethylene, polyvinylpirolidone, double matrix) and spacers was also studied. The best results (the maximal diffraction efficiency of 7.9% and the minimal specific recording energy of 0.38 J/(cm2 %)) are obtained for ChG with one NO2 acceptor group covalently bonded to tolyle matrix. Double matrix considerably decreases the recording energy and the hologram lifetime, and enables more efficient vector recording.The conclusion is made that ChG photoorientation accompanied by other processes is responsible for 633 nm recording. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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