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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.2: Vortrag
Dienstag, 17. März 2020, 10:45–11:00, WIL A317
Broadband plasmonic spectroscopy of vectorial near-field coupling — •Martin Esmann1,2, Simon F. Becker2, Julia Witt2, Jinxin Zhan2, Abbas Chimeh2, Anke Korte2, Jinhui Zhong2, Ralf Vogelgesang2, Gunther Wittstock2, and Christoph Lienau2 — 1CNRS Centre for Nanoscience and Nanotechnology (C2N), Palaiseau, France — 2Carl von Ossietzky University, Oldenburg, Germany
The coherent coupling of optical near fields between dipole momenta determines the function and optical properties of many nanostructures[1]. These interactions extend over a few nanometers only and depend sensitively on the vectorial properties of the coupled near fields, i.e., on relative dipole orientation, spectral detuning and dephasing. This makes it challenging to analyze and control them experimentally.
Here, we introduce plasmonic nanofocusing [2] spectroscopy [3] as a tool to record coherent light scattering spectra with 5-nm spatial resolution from a small dipole antenna, excited solely by evanescent fields. We couple the antenna to plasmon resonances in single gold nanorods and resolve mode couplings, resonance energy shifts and Purcell effects as a function of dipole distance and relative orientation. We show how they arise from different vectorial components of the interacting near-fields. Our results pave the way to using dipolar alignment for the in-situ control of optical properties and function in nanoscale systems.
[1] Zhang, Y. et al., Nature 531, 623 (2016).
[2] Stockman, M.I., PRL 93, 137404 (2004).
[3] Esmann, M. et al., Nature Nanotech. 14, 698 (2019).