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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 23.22: Poster

Monday, March 7, 2016, 18:15–20:30, Poster E

Electrodynamics of Gold Nano-Sponges — •Felix Schwarz, David Leipold, and Erich Runge — Institut für Physik und Institut für Mikro- und Nanotechnologien, TU Ilmenau

Taylored disorder can prove most beneficial in nanophotonics: Not only are systems inherently unaffected by perturbations caused by, e.g., temperature, but also disorder-induced localization can appear and symmetry-breaking causes light-trapping in otherwise dark modes. Recently, irregular nanoporous gold sponges with a diameter of around 200nm and features on the 20nm scale made by clever metallurgy were presented [1]. Our numeric calculations of plasmonic resonances show that surprisingly long-lived modes with greatly enhanced near-field intensities can be excited. The results reproduce important aspects of scattering and nonlinear photoemission spectra found in recent experimental studies [1,2]. These are intuitively explained in terms of interacting near-field modes and their coupling to the far-field. Furthermore, we discuss the impact of our findings on future practical applications, e.g. in chemical sensing.

[1] C. Vidal et al., ACS Photonics, 2, 1436 (2015)

[2] G. Hegert, C. Lienau, private communication