Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 10: Optical and nonlinear optical properties, photonic
DF 10.5: Vortrag
Dienstag, 12. März 2013, 11:00–11:20, H11
Near-field optical microscopy of femtosecond laser reshaped silver nanoparticles in dielectric matrix — •Moritz Beleites1, Christian Matyssek2,3, Hans-Helmuth Blaschek4, and Gerhard Seifert1 — 1Zentrum für Innovationskompetenz SiLi-nano, Martin-Luther-Universität Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, D-06120 Halle (Saale) — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle (Saale) — 3Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle (Saale) — 4Fraunhofer-Institut für Werkstoffmechanik IWM Halle, Walter-Hülse-Str. 1, D-06120 Halle (Saale), Germany
Near-field scanning optical microscopy (NSOM) and microscope spectrometry have been utilized to detect and evaluate shape transformation of individual silver nanoparticles embedded in a thin dielectric layer (40 nm Al2O3 ). Shape modification was previously executed by femtosecond laser irradiation of samples containing spherical nanoparticles. The NSOM measurements were performed with several optical wavelengths of unpolarized and linearly polarized light on different regions of the samples containing spherical and transformed nanoparticles. We were able to unambiguously identify reshaped, spheroidal nanoparticles by polarization dependent switching of the NSOM contrast at individual particles. In combination with microsope spectrometry, this allows analyzing orientation and aspect ratio of single metal nanoparticles.