Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: Plasmonics and nanooptics: Light-matter interaction, spectroscopy III
O 34.3: Talk
Tuesday, March 13, 2018, 14:30–14:45, MA 041
Vectorial near-field coupling — •Martin Esmann1,2, Simon F. Becker2, Julia Witt2, Ralf Vogelgesang2, Gunther Wittstock2, and Christoph Lienau2 — 1CNRS Centre de Nanosciences et de Nanotechnologies (C2N), 91460 Marcoussis, France — 2Carl von Ossietzky University, 26111 Oldenburg, Germany
The coherent exchange of optical near fields between two neighboring dipoles plays an essential role for the optical properties, quantum dynamics and thus for the function of many naturally occurring and artificial nanosystems[1,2]. These interactions are inherently short-ranged, extending over a few nanometers only, and depend sensitively on relative orientation, detuning and dephasing, i.e., on the vectorial properties of the coupled dipolar near fields. This makes it challenging to analyze them experimentally.
Here, we introduce plasmonic nanofocusing[3] spectroscopy to record coherent light scattering spectra with 5-nm spatial resolution 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 energy shifts and Purcell effects as a function of dipole distance and relative orientation, and show how they arise from different vectorial components of the interacting optical near-fields. Our results pave the way for using dipolar alignment to control the optical properties and function of nanoscale systems.
[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).