Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

patterning consisting of nano-structural elements smaller than incident light wavelength.
The decreasing of light reflection for such structures results from light diffraction on
above mentioned structures. Nanostructured antireflective elements are formed by
holographic recording in chalcogenide photoresist. The next step is electrochemical
growing of Ni shim used as a stamp for printing of nanostructures into organic polymer
– laminate which can be pasted on glass surface. Nano-relief surface are transferred into
transparent polymer films by hot embossing at 100-120 0 C or UV curing.
The nanostructures with a sizes less than 100 nm were fabricated by immersion
holography in amorphous chalcogenids, organic azobenzol and photopolymer films. For
recording UV CW lasers with 325nm wavelength (He-Cd laser) and 266nm (frequency
doubler pumped by Verdi-8 laser 532 nm radiation) and visible region lasers (442 and
532 nm) were used. The conventional photoresist technology and as well as direct relief
fabrication method - surface relief formation in amorphous films during the holographic
recording were used. For holographic grating forming was used Two-beam holographic
setup for 1D, and three- and more beams holographic setup with possibility to change
polarization state for each beam for 2D structural element recording were used.
Optical properties of nanostructures as transmission, reflection, diffraction
efficiency and their spectral dependences were studied. The form and size of
nanostructures were studied by AFM.
OPTICAL RECORDING IN AZOBENZENE CONTAINING
POLYMER FILMS
A. Gerbreders and J. Teteris.
Preparation method and optical properties of spiropyran and polymer composite
thin films was studied. Polyvinyl acetate, polymethylmetacrylate and copolymer of
poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) were used as base for composite.
The transmission spectra of composites were measured before and after
illumination by laser beams with different wavelengths. Transmission of composite film
of merocianine form was measured by laser beam wavelength 532 nm in dependence on
beam intensity.
The holographic recording of diffraction gratings was performed by different laser
lines (325, 532 nm). During recording the diffraction efficiency was measured in
transmission mode. The profiles of the gratings area were analyzed by AFM microscope.
Scientific Publications
1. U.Gertners, Z.Alute and J.Teteris, The correlation between polarization and
light-induced mass transfer processes in chalcogenide vitreous semiconductors,
4rd International Conference “Radiation interaction with material and its use in
technology 2012” Kaunas, Lithuania, May 14-17, 2012, pp. 474-478.
2. A.N.Trukhin, K.M.Golant, J.Teteris, Absorption and luminescence in
amorphous Si x Ge 1-x O 2 films fabricated by SPCVD, JNCS, 358 (2012) 1538-
1544.
3. J.Aleksejeva, J.Teteris, Photoinduced phenomena in azo-dyed gelatine films,
IOP Conf. Series:Materials Science and Engineering, 38 (2012) 012028.
4. A.Gerbreders, O.Shimane, V.Kolbjonoks, J.Teteris, UV optical record and
electron beam lithography in polymer films, IOP Conf. Series:Materials Science
and Engineering, 38 (2012) 012027.
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