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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 couplingMartin Esmann1,2, Simon F. Becker2, Julia Witt2, •Anke Korte2, Abbas Chimeh2, Jinxin Zhan2, Jinhui Zhong2, Ralf Vogelgesang2, Gunther Wittstock2, and Christoph Lienau21CNRS 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).

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