Organic-inorganic films based on SiO₂, containing Disperse Red 1 (DR1), carbazole units and 2,4,7-trinitro-9-fluorenone (TNF), have been prepared by a sol-gel technique. Diffraction gratings have been produced through different effects: photoinduced birefringence and photorefractivity, using 488.0 nm and 632.8 nm light, respectively. Pure polarization holographic birefringence gratings have been investigated and diffraction efficiencies higher than those obtained by light intensity modulation have been measured. The study of the temporal behavior of the diffraction efficiencies makes possible the identification of different processes involved in the DR1 molecular orientation: angular hole burning (AHB), angular redistribution (AR), Cis molecules gain has been determined by two-beam coupling (2BC) measurements. The effect of the polarization of the writing beams on the grating and of a circularly polarized photoisomerizing radiation during grating erasure has been interpreted in terms of an orientation contribution to the grating formation.

Date Published: 8 August 2003
PDF: 8 pages
Proc. SPIE 5123, Advanced Optical Devices, Technologies, and Medical Applications, (8 August 2003); doi: 10.1117/12.517012

Published in SPIE Proceedings Vol. 5123:
Advanced Optical Devices, Technologies, and Medical Applications
Janis Spigulis; Janis Teteris; Maris Ozolinsh; Andrejs Lusis, Editor(s)