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Spin-Polarized Photon Emission by Resonant Multipolar Nanoantennas

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journal contribution
posted on 19.11.2014, 00:00 by Sergey S. Kruk, Manuel Decker, Isabelle Staude, Stefan Schlecht, Michael Greppmair, Dragomir N. Neshev, Yuri S. Kivshar
We demonstrate nanoscale spin control of photons emitted by an atomic system coupled to a compact plasmonic nanoantenna supporting phase-locked interference of different multipolar moments within a single resonance. Experimentally we observe chiral light emission from quantum dots over split-ring resonant nanoantennas, where the spin of the emitted photons is locked to their transverse momentum. We demonstrate that the polarization can vary from linear to elliptical with ellipticity reaching ±0.5 for emission into opposite halves of the symmetry plane of the nanoantenna.