PLASMON RESONANSE IN THE PLANAR LAYERED SILVER-NICKEL PHTHALOCYANINE NANOSTRUCTURES
Abstract
Spectral properties of nickel phthalocyanine (NiPc) and silver (Ag) thin films, as well as of planar hybrid nanostructures composed of organic semiconductor nanometer films contacting with silver island structures were studied. All nanostructures were fabricated by thermal vacuum evaporation on glass and quartz substrates (S). Two configurations of planar hybrid nanostructures were investigated, in which the silver nanoparticle monolayer was placed under the NiPc film (S/Ag/NiPc) and over the NiPc film (S/NiPc/Ag). The NiPc film thickness was changed from 10 to 30 nm. The silver surface density was about 2⋅10-6 g/cm2. The surface structure of films was studied with the use of a scanning probe microscope “Solver P47 - PRO” in the semi-contact regime. Optical spectra were recorded by a spectrophotomer “Cary 500”. The most significant increase
in the organic film absorption in a presence of Ag nanoparticles was observed for the NiPc film thickness of 10 nm over the spectral range of electronic absorption bands λ ~ 600–700 nm. The effect is due to the local field strengthening near the plasmonic nanoparticles surface for distances compared with nanoparticle sizes. Quantitative regards showed that for the nanostructures of S/Ag/NiPc and S/NiPc/Ag the existence of Ag nanoparticles leads to an increase in the optical density at the wavelength λ = 625 nm at 25 and 33 %, respectively. We suppose that the dependence of the NiPc film effective absorption on the hybrid nanostructure configuration may be related to the features of the nanostructure formation in the process of thermal evaporation.
in the organic film absorption in a presence of Ag nanoparticles was observed for the NiPc film thickness of 10 nm over the spectral range of electronic absorption bands λ ~ 600–700 nm. The effect is due to the local field strengthening near the plasmonic nanoparticles surface for distances compared with nanoparticle sizes. Quantitative regards showed that for the nanostructures of S/Ag/NiPc and S/NiPc/Ag the existence of Ag nanoparticles leads to an increase in the optical density at the wavelength λ = 625 nm at 25 and 33 %, respectively. We suppose that the dependence of the NiPc film effective absorption on the hybrid nanostructure configuration may be related to the features of the nanostructure formation in the process of thermal evaporation.
About the Authors
A. D. Zamkovets
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Ph. D. (Physics and Mathematics), Senior researcher of the Laboratory of Physics of Infrared Rays
Belarus
Ph. D. (Physics and Mathematics), Senior researcher of the Laboratory of Physics of Infrared Rays
A. N. Ponyavina
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
D. Sc. (Physics and Mathematics), Assistant Professor, Chief researcher of the Laboratory of Physics of Infrared Rays
Belarus
D. Sc. (Physics and Mathematics), Assistant Professor, Chief researcher of the Laboratory of Physics of Infrared Rays
L. V. Baran
Belarusian State University
Belarus
Ph. D. (Physics and Mathematics), Head of the Department for Scientific-Research Service, Department of Physics of Solid States
Belarus
Ph. D. (Physics and Mathematics), Head of the Department for Scientific-Research Service, Department of Physics of Solid States
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