Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 93: Plasmonics & Nanooptics VI: Near-Field Microscopy and Phenomena
O 93.2: Vortrag
Freitag, 5. April 2019, 10:45–11:00, H8
Vectorial near-field coupling — Martin Esmann1,2, Simon F. Becker2, Julia Witt2, •Anke Korte2, Abbas Chimeh2, Jinxin Zhan2, Jinhui Zhong2, Ralf Vogelgesang2, Gunther Wittstock2, and Christoph Lienau2 — 1CNRS Centre de Nanosciences et de Nanotechnologies (C2N), 91220 Palaiseau, France — 2Carl von Ossietzky University, 26111 Oldenburg, Germany
The coherent exchange of optical near-fields between neighboring dipoles is essential for the optical properties, quantum dynamics and thus for the function of many naturally occurring and artificial nanosystems[1,2]. These interactions are inherently nanometer-ranged and depend sensitively on relative orientation, spectral detuning and dephasing, i.e., on the vectorial properties of the coupled dipolar near-fields. This makes them challenging to analyze experimentally.
Here, we introduce plasmonic nanofocusing[3] spectroscopy to record coherent light scattering spectra with 5-nm spatial resolution[4] from a small dipole antenna, excited solely by evanescent fields and coupled to plasmon resonances in a single gold nanorod. We resolve mode couplings, resonance shifts and Purcell effects as a function of dipole alignment, and show how they arise from different vectorial components of the interacting near-fields. Our results pave the way to control optical properties and function of nanoscale systems by dipolar alignment.
[1] Zhang, Y. et al., Nature 531, 623 (2016).
[2] Scholes, G.D., et al., Nature Chemistry 3, 763 (2011).
[3] Stockman, M.I., PRL 93, 137404 (2004).
[4] Esmann, M., et al., arXiv:1801.10426 (2018).