Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)

O 9.12: Vortrag

Montag, 16. März 2020, 13:15–13:30, WIL A317

Strong surface plasmon localization in gold nanosponges probed by plasmonic nanofocusing spectroscopy — •Anke Korte1, Abbas Chimeh1, Jinhui Zhong1, Dong Wang2, Peter Schaaf2, and Christoph Lienau11Carl von Ossietzky Universität Oldenburg, Germany — 2Technische Universität Ilmenau, Germany

Porous gold nanosponges, percolated with a three-dimensional network of 10 nm sized ligaments, recently emerged as promising substrates for plasmon-enhanced spectroscopy. Experimental and theoretical studies suggest surface plasmon localization in small hot-spots. To probe the existence of such hot-spots, we have first used scattering-type scanning near-field optical microscopy with homodyne detection of the scattered signal from individual nanosponges to reveal such strong spatially and spectrally confined modes. By recording local near-field scattering spectra, high quality factors of 40 for individual hot-spots are demonstrated. More recently, we combined this method with plasmonic nanofocusing, where surface plasmon polaritons propagate along the shaft of a conical gold taper and form an isolated nano light source. This removes unwanted background since hot-spot modes are locally excited just by the nano-localized tip dipole field, resulting in a highly improved signal-to-noise-ratio and a simplified image interpretation. This advanced technique is used to investigate the coupling behaviour between such hot-spot modes and small quantum emitters, which were deposited inside the pores of a nanosponge.

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