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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Plasmonics & Nanooptics V: Nanostructures and Nanoantennae

O 76.8: Vortrag

Donnerstag, 4. April 2019, 12:15–12:30, H8

Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges — •Anke Korte1, Jinhui Zhong1, Abbas Chimeh1, Felix Schwarz2, Juemin Yi1, Dong Wang3, Jinxin Zhan1, Peter Schaaf3, Erich Runge2, and Christoph Lienau11Institut für Physik & Center of Interface Science, Carl von Ossietzky Universität, 26129 Oldenburg, Germany — 2Institut für Physik & Institut für Mikro- und Nanotechnologien MacroNano, TU Ilmenau, 98693 Ilmenau, Germany — 3Institut für Werkstofftechnik & Institut für Mikro- und Nanotechnologien MacroNano, TU Ilmenau, 98693 Ilmenau, Germany

Porous nanosponges, percolated with a three-dimensional network of 10 nm sized ligaments, recently emerged as promising substrates for plasmon-enhanced spectroscopy and (photo)catalysis. Experimental and theoretical work suggests surface plasmon localization in some hot-spot modes as the physical origin of their unusual optical properties, but so far the existence of such hot-spots has not been proven. Here we use scattering-type scanning near-field nanospectroscopy on individual gold nanosponges to reveal spatially and spectrally confined modes at 10 nm scale by recording local near-field scattering spectra. High quality factors of individual hot-spots of more than 40 are demonstrated, predicting high Purcell factors up to 10^6. The observed field localization and enhancement make such nanosponges an appealing platform for a variety of applications ranging from nonlinear optics to strong-coupling physics.

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