Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 85: Poster: Enabling Technologies: Cavity QED
FM 85.8: Poster
Donnerstag, 26. September 2019, 16:30–18:30, Tents
Natural cavities with huge Purcell factors in gold nano sponges — Felix Schwarz1, Sebastian Bohm1, •Erich Runge1, Dong Wang1, Peter Schaaf1, Jinhui Zhong2, Juemin Yi2, and Christoph Lienau2 — 1TU Ilmenau — 2Universität Oldenburg
Metallurgically produced porous gold nanoparticles, so-called nano sponges, are a cheap and mass-producible system of fascinating quantum mechanical and quantum optical properties. For optimized parameters (filling factor, pore size, pore shapes...)[1] and in any given frequency range, always some local pore configurations will act as natural nano antennae and nano cavities[2] with huge Purcell factors 7000. Under illumination, electromagnetic energy is transferred from the wavelength scale via the Mie resonance of the whole nano particle (∼200 nm) into hot-spots of tens of nm size or less[3]. The strongly enhanced electromagnetic fields in the hot spots live rather long and dominate the non-linear properties of the sponge, as has been shown via electron emission in Ref. [2]. Thus, tailored gold nanosponges have the potential to be an enabling technology for the exploitation of QED effects in mass-produced systems.
[1] Towards optimal disorder in gold nanosponges for long-lived localized plasmonic modes, F. Schwarz, E. Runge, Ann. Phys. (Berlin) 529(12), 1600234 (2017);
[2] Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas, G. Hergert et al., Light: S&A 6(10), e17075 (2017);
[3] Strong spatial and spectral localization of surface plasmons in individual randomly disordered gold nanosponges, J. Zhong et al., Nano Lett. 18 (8), 4957-4964 (2018)