Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II

O 25.2: Talk

Tuesday, March 13, 2018, 10:45–11:00, MA 041

Zooming in on the Surface: Numerics for Localization of Light on Coated Nanosponges — •Felix Schwarz and Erich Runge — TU Ilmenau, Institut für Physik und IMN MacroNano, 98693 Ilmenau

Nanoporous gold-nanoparticles (nanosponges) are an outstanding example for disorder-induced localization of light and huge field-enhancements, as shown by photoemission from long-lived, highly localized plasmons with unmatched excitation efficiencies [1]. Coated with nonlinear optical materials or quantum dots, these particles could serve as an easy-access tool for quantum optics and ultra-sensitive chemical sensors. However, as the nature of the localization and environment-induced changes remain poorly understood, the integration of these features proves difficult. Simulations are necessary to design structures with optimally tailored disorder properties for the given task. The challenge for these simulations is the required nanometer resolution to confidently resolve details of localized optical modes in thin coatings. We address this challenge by employing transformation optics to gain variable resolution in our simulation methods in addition to effective-medium approaches for domains where high resolution is not necessary. Results for various nanosponge geometries are presented and compared to recent experiments.

[1] G. Hergert et al., Light: Science & Applications (2017) 6, e17075 (2017)