Self-Enhancenment of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films
Optics and Photonics Journal 2014
Andris Ozols, Valdis Kokars, Pēteris Augustovs, Dmitrijs Malinovskis, Kaspars Traskovskis, Elmārs Zariņš, Ģirts Ivanovs

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 mkm to 0.5 mkm. No relaxational SE effect is found. Coherent SE effect in molecular glasses is found to be weaker than in inorganic materials.


Atslēgas vārdi
Self-enhancement of holograms, light polarization, holographic gratings, molecular glasses
DOI
10.4236/opj.2014.46015
Hipersaite
http://dx.doi.org/10.4236/opj.2014.46015

Ozols, A., Kokars, V., Augustovs, P., Malinovskis, D., Traskovskis, K., Zariņš, E., Ivanovs, Ģ. Self-Enhancenment of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films. Optics and Photonics Journal, 2014, Vol. 4, No. 6, 143.-152.lpp. ISSN 2160-8881. e-ISSN 2160-889X. Pieejams: doi:10.4236/opj.2014.46015

Publikācijas valoda
English (en)
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