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O: Fachverband Oberflächenphysik
O 24: Plasmonics and Nanooptics: Fabrication, Characterization and Applications
O 24.2: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Macrocopic self-assembled anisotropic metal-insulator-metal nanoparticles for tunable magnetic modes — •Max Schnepf1, Martin Mayer1, Moritz Tebbe2, Tobias A.F. König1, and Andreas Fery1 — 1Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden — 2Dept. of Physical Chemistry II, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth
We present the synthesis and optical characterization of anisotropic metal-insulator-metal nanoparticles featuring intrinsic metamaterial properties within the visible wavelength range. The nanoparticle consists of a single crystalline gold nanorod core and a silver/gold hybrid nanobox shell, separated by a dielectric spacer. The magnetic mode can be tailored by distance variations between the nanorod core and the nanobox using a three-step synthesis. To clearly distinguish between the longitudinal and transversal mode, we have incorporated the anisotropic nanoparticle into a stretchable polymer film (polyvinyl alcohol, PVA). Stretching of the polymer film results in macroscopic alignment of the nanoparticles. Using conventional UV/vis scattering and absorption spectroscopy, we were able to identify the absorption dominated magnetic modes. We confirmed the magnetic mode properties with finite-difference time-domain (FDTD) simulations. This simple and rational particle design is capable of enabling bottom-up fabrication of colloidal optical metamaterials on macroscopic areas.