Abstract
The optical properties of a composite material consisting of a thin polymer film, which is activated by semiconductor CdSe/ZnS quantum dots (QDs) and silver nanoparticles, on a transparent dielectric substrate have been investigated. It is revealed that the presence of silver nanoparticles leads to an increase in the QD absorption (by a factor of 4) and in the fluorescence intensity (by a factor of 10), whereas the fluorescence time drops by a factor of about 10. Excitation of the composite medium by a pulsed laser is found to result in narrowing of the fluorescence band and a sublinear dependence of its intensity on the pulse energy. In the absence of silver nanoparticles, the fluorescence spectrum of QDs is independent of the excitation-pulse energy density, and the fluorescence intensity depends linearly on the pulse energy in the entire range of energy densities, up to 75 mJ/cm2.
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Original Russian Text © A.G. Bakanov, N.A. Toropov, T.A. Vartanyan, 2016, published in Optika i Spektroskopiya, 2016, Vol. 120, No. 3, pp. 502–507.
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Bakanov, A.G., Toropov, N.A. & Vartanyan, T.A. Optical Properties of Planar Nanostructures Based on Semiconductor Quantum Dots and Plasmonic Metal Nanoparticles. Opt. Spectrosc. 120, 477–481 (2016). https://doi.org/10.1134/S0030400X16030048
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DOI: https://doi.org/10.1134/S0030400X16030048