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HL: Fachverband Halbleiterphysik

HL 60: Poster II: Optical Properties, incl. Photonic Crystals and Ultrafast Phenomena

HL 60.31: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Optical Properties of Silver Nanoparticles in Glass — •Christian Matyssek^2,3, Andrei Stalmashonak¹, Oleksiy Kiriyenko², Wolfram Hergert², and Gerhard Seifert¹ — ¹MLU Halle, Optics Group, von-Danckelmann-Platz 3, 06120 Halle — ²MLU Halle, Theoretical Physics Group, von-Seckendorff-Platz 1, 06120 Halle — ³Max-Planck-Institute for Microstructure Physics, Weinberg 2, 06120 Halle

The optical properties of silver nanoparticles (SNPs) in glass are studied. It is possible to transform initially spherical particles with the help of laser pulses with linear polarisation resulting in a prolate spheroidal shape[1]. The transformation process stops for wavelengths shorter than the plasmon resonance of the SNPs. A model for the explanation of the SNP shape modification based on the electric field enhancement at the particle-glass-interface was developed[2]. In order to confirm this model, the extinction efficiency and the electric field enhancement around the particles are calculated. Though for spherical particles Mie theory can be applied, and in principle it could be extended to spheroidal particles, no implementation of this method exists yet. Therefore the calculations for the spheroidal particles are done using the Finite-Element-Method (FEM). The results are in good agreement with experimental findings. While the calculations were done assuming the bulk permittivity for silver, the application of a non-local permittivity for small particles is discussed.

[1] A. Stalmashonak et. al., Opt. Lett. 32, 3215 (2007)

[2] A. Stalmashonak et. al., App. Phys. B. 94, 459 (2009)