Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 43: Nanomaterials
MM 43.3: Vortrag
Mittwoch, 14. März 2018, 17:30–17:45, H 0106
Hotspot-mediated non-dissipative and ultrafast plasmon passage — Eva-Maria Roller1, Lucas V. Besteiro2, Claudia Pupp1, Larousse Khosravi Khorashad2, Alexander O. Govorov2, and •Tim Liedl1 — 1Ludwig-Maximilians-Universität München, Germany — 2Ohio University, Athens, Ohio, USA.
Charge oscillations between two spatially separated entities via a virtual middle state are examples of electron-based population transfer but their realization requires precise control over nanoscale assembly of heterogeneous plasmonic particles. We here show the assembly and optical analysis of a triple particle system consisting of a chain of two Au nanoparticles with an inter-spaced Ag island [1]. We observe strong plasmonic coupling between the spatially separated Au particles mediated by the connecting Ag particle with almost no dissipation of energy. This is a result of the too high excitation energy of the Ag island compared to that of the Au particle leading to only quasi-occupation of the transfer channel. We describe this effect both with exact classical electrodynamic modeling and qualitative quantum-mechanical calculations. We identify the formation of strong hot spots between all particles as the main mechanism for the loss-less coupling between the remote partners. The observed spectra are consistent with a description of coherent ultra-fast energy transfer and could thus prove useful for applications such as quantum gate operations but also for classical charge and information transfer processes [2].
[1] Roller et al. Nat. Phys. 13 (2017) 761
[2] Maier, S. A. et al. Nat. Mater. 2 (2003) 229