Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 23: Plasmonics and Nanooptics II: Light-Matter Interaction
HL 23.7: Vortrag
Montag, 20. März 2017, 16:30–16:45, TRE Ma
Double Modematching for Metal Nanoantennas — •Thorsten Feichtner1, Silke Christiansen2,3, and Bert Hecht1 — 1Nano-Optics & Biophotonics Group, Department of Experimental Physics 5, Röntgen Research Center for Complex Material Research (RCCM), Physics Institute, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 3Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1, 91058 Erlangen, Germany
The efficient coupling of photons from propagating far-fields to nanoscale volumes is a fundamental problem in quantum optics and at the heart of light-matter interaction. A common model system is the coupling between a point-like two-level quantum emitter (QE) and the continuum of radiative modes, which can be expressed in terms of the frequency-dependent partial local density of states (LDOS) at the QE position. Resonant plasmonic nanoantennas can be designed to strongly localize fields into a small volume leading to a LDOS enhanced by a factor of 105 and possibly beyond.
Here a description of power transfer between a QE and an optical antenna resembling a three-dimensional mode matching formalism is developed[1]. After introducing a second dipole in the far-field, another mode-matching step leads to a set of novel optical antenna design guidelines for QE emission enhancement. Accordingly a plasmonic cavity antenna (PCA) geometries is devised and compared to an established dipolar two-wire antenna geometry.
[1] T. Feichtner, S.H. Christiansen, and B. Hecht; arXiv:1611.05399