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Publikācija: Holographic Recording of Surface Relief Gratings in Stilbene Azobenzene Derivatives at 633 nm

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Holographic Recording of Surface Relief Gratings in Stilbene Azobenzene Derivatives at 633 nm
Field of research 1. Natural sciences
Sub-field of research 1.3 Physical sciences
Authors Andris Ozols
Dmitrijs Saharovs
Valdis Kokars
Valdis Kampars
Ansis Maļeckis
Gundars Mežinskis
Artūrs Plūdons
Keywords Holography, surface relief gratings, azobenzene
Abstract Holographic recording in stilbene azobenzene derivatives by He-Ne 633 nm laser light has been experimentally studied. It was found that surface relief gratings (SRG) can be recorded by red light. Usually shorter wavelengths are used to induce the trans-cis photoisomerization in organic materials. SRG with 2 μm period and an amplitude of 130 nm have been recorded with 0.88 W/cm2 light in about 20 minutes in amorphous films of 3-(4-(bis(2- (trityloxy)ethyl)amino)phenyl)-2-(4-(2-bromo-4-nitrophenyl)diazenyl)phenyl)acrylonitrile spin-coated on glass substrates. Self-diffraction efficiency up to 17.4% and specific recording energy down to 114 J/(cm2%) were measured. The recorded SRG were stable as proved by subsequent AFM measurements. The photo-induced changes in absorption spectra did not reveal noticeable signs of trans-cis transformations. Rather, spectrally uniform bleaching of the films took place. We conclude that a photothermally stimulated photo-destruction of chromophores is responsible for the SRG recording. The recording of stable SRG in the stilbene azobenzene derivatives we studied is accompanied by the recording of relaxing volume-phase gratings due to the photo-orientation of chromophores by the linearly polarized recording light. It should also be noted that holographic recording efficiency in stilbene azobenzene derivatives exhibit an unusual non-monotonic sample storage-time dependence presumably caused by the peculiarities of structural relaxation of the films.
DOI: 10.1088/1742-6596/249/1/012055
Hyperlink: http://iopscience.iop.org/1742-6596/249/1/012055/ 
Reference Ozols, A., Saharovs, D., Kokars, V., Kampars, V., Maļeckis, A., Mežinskis, G., Plūdons, A. Holographic Recording of Surface Relief Gratings in Stilbene Azobenzene Derivatives at 633 nm. Journal of Physics: Conference Series, 2010, Vol.249, No.1, pp.012055-012055. ISSN 1742-6588. Available from: doi:10.1088/1742-6596/249/1/012055
Additional information Citation count:
ID 9049