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Title: Laser operated borate polymer nanocomposites
Authors: Ali Hussain, Reshak, Prof. Dr.
Gandham, Lakshminarayana
Burak, Ya V.
Adamiv, Volodymyr T.
Keywords: Nanoparticles;Optical materials;Centrosymmetric;Polymer;Nanocrystallites
Issue Date: 28-Jan-2011
Publisher: Elsevier B.V.
Citation: Journal of Alloys and Compounds, vol. 509 (4), 2011, pages 1271-1274
Abstract: We have found that UV polarized treatment of the nanocrystals (non-centrosymmetric Li2B4O7 and centrosymmetric α-BaB2O4) embedded into the olygoether acrylate photopolymer samples cause substantially different response depending on the laser features. For the Li2B4O 7 NC, during treatment by pulsed 7 ns laser polarized nitrogen laser pulses at 337 nm we observed substantial red spectral shift of the energy gap from 7.3 eV up to 6.3 eV. The spectral shift is disappeared during the 15 min after the interruption of optical treatment. The effect exists only in the nanocrystallites with sizes below 200 nm. At the same time for the centrosymmetrical α-BaB2O4 nanocrystallites this effect was absent. However the photoinduced second order optical effects induced by coherent bicolor treatment by wavelengths 532 nm and 266 nm are enhanced for the α-BaB2O4 NC and are absent for the Li 2B4O7 ones.
Description: Link to publisher's homepage at http://www.elsevier.com/
URI: http://www.sciencedirect.com/science/article/pii/S0925838810024953
ISSN: 0925-8388
Appears in Collections:School of Microelectronic Engineering (Articles)

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