Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 75: Plasmonics and Nanooptics

O 75.12: Poster

Wednesday, March 18, 2015, 18:15–21:00, Poster A

Periodic plasmonic nanoparticle arrays with controllable interparticle distances and plasmon resonance coupling — •Kirsten Volk and Matthias Karg — Physical Chemistry I, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany

Surface plasmons (SPs) are light induced collective oscillations of the electron liquid in respect to the crystal lattice at a metamaterial-dielectric interface with permittivities of different signs. When employing nanoparticles with a size smaller than the sink depth, optical fields can penetrate its entire volume and drive localized surface plasmon oscillations. The plasmon resonance wavelength of metallic nanoparticles is highly dependent on the size, shape and the material of the nanoparticle. Additionally the localized surface plasmon resonance (LSPR) is sensitive to the dielectric environment and the interparticle distance in nanoparticle arrays. Varying these two parameters significant changes of the optical properties of the system due to coupling can be achieved.

In this contribution we show how to make use of the dielectric environment and interparticle distance dependence of LSPRs to create functional materials with tailored optical properties. As particular building blocks we employed silver nanoparticles, which are coated by a polymer shell. The particles are then self-assembled into highly ordered hexagonally packed monolayers by a floatation approach. The interparticle distances can be exactly tuned by the dwell-time of the particles at the liquid-air interface. By placing the monolayers on substrates with high refractive indices the optical properties of the system can be further enhanced.