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Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

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DOI: 10.4236/opj.2014.46015    1,635 Downloads   2,166 Views   Citations

ABSTRACT

Self-enhancement (SE) effect of scalar and vector holographic gratings (HG) recorded in three different azobenzene molecular glassy films is experimentally studied in both transmission and reflection modes at 532 and 633 nm. The maximal SE factor (the ratio of diffraction efficiency to its initial value) SEF = 42 has been achieved. It is shown that the model of complementary HG can be applied also in scalar transmission thin HG case to explain coherent SE. The possibility of vector HG coherent SE in transmission mode is experimentally demonstrated for the first time (SEF = 4.3). The possibility of coherent HG SE in reflection mode is also established for the first time (SEF = 21). HG recording processes as well as coherent SE processes are found to be independent in transmission and reflection modes being determined by volume and surface relief HG, respectively. The permittivity gradient mechanism is proposed to explain the coherent SE of surface relief HG. Both HG recording and coherent SE efficiencies strongly decrease when HG period is decreased from 2 mm to 0.5 mm. No relaxational SE effect is found. Coherent SE effect in molecular glasses is found to be weaker than in inorganic materials.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Ozols, A. , Kokars, V. , Augustovs, P. , Malinovskis, D. , Traskovskis, K. , Zarins, E. and Ivanovs, G. (2014) Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films. Optics and Photonics Journal, 4, 143-152. doi: 10.4236/opj.2014.46015.

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