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Publikācija: Dark Relaxation of Holographic Gratings in Azobenzene and Chalcogenide Films

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Dark Relaxation of Holographic Gratings in Azobenzene and Chalcogenide Films
Field of research 1. Natural sciences
Sub-field of research 1.3 Physical sciences
Authors Andris Ozols
Pēteris Augustovs
Kristers Ķēniņš
Valdis Kokars
Elmārs Zariņš
Kaspars Traskovskis
Dmitrijs Saharovs
Keywords Azobenzene, holographic gratings, dark relaxation, chalcogenide films
Abstract Studies of transmission holographic grating (HG) relaxation (recorded with s-s, p-p, s-p, L-L, L-R laser beam polarizations) have been carried out in organic molecular azobenzene glassy films W-50 and W-75, and in chalcogenide glassy a-As2S3 film. Results previously obtained with azobenzene molecular glassy K-RJ-9 films also are used for comparison. HG with the periods of 0.50, 2.0 and 8.6 μm were studied in these films. It is found that recording efficiency in the same sample depends on both recording polarizations and HG period. The HG stability in the course of relaxation also depends on these factors. Anticorrelation has been observed of HG recording efficiency and stability. Recording was efficient with p-p or L-R polarizations at 2.0 μm HG period whereas it was stable with s-s L-L polarizations at 8.6μm HG period. As a rule, HG stability was higher in the samples with higher glass transition temperature. The HG dark (relaxational) self-enhancement of HG was observed in the case of W-75 (L-R polarizations, 0.50μm; s-s polarizations, 2.0μm) and in previously studied K-RJ-9 (p-p polarizations, 8.6μm) samples. Relaxational changes in diffraction efficiency are explained in terms of post-recording mass transfer under the influence of photoinduced spatially periodic mechanical stress.
DOI: 10.1088/1757-899X/77/1/012018
Hyperlink: http://iopscience.iop.org/1757-899X/77/1 
Reference Ozols, A., Augustovs, P., Ķēniņš, K., Kokars, V., Zariņš, E., Traskovskis, K., Saharovs, D. Dark Relaxation of Holographic Gratings in Azobenzene and Chalcogenide Films. IOP Conference Series: Materials Science and Engineering, 2015, Vol.77, Iss.1, pp.12-18. ISSN 1757-8981. e-ISSN 1757-899X. Available from: doi:10.1088/1757-899X/77/1/012018
Additional information Citation count:
  • Scopus  0
ID 20857