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Optically engineered emission: from the weak to the strong coupling regime I

10:30 Invited talk : Quantum manipulation of polariton fluids with structured light

Alberto Bramati

UPMC (France)

Polaritons behave as a quantum fluid and can exhibit superfluidity. In this regime, we observed the formation of a lattice of vortex-antivortex pairs due to colliding flows of polaritons and the appearance of same-sign quantized vortex chain in an ensemble of polaritons with an orbital angular momentum (OAM), injected by a Laguerre-Gauss beam. The formation of a vortex chain is a consequence of the quantization of the total angular momentum transferred to the superfluid.
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10:50 : Information processing with topologically protected vortex memories in exciton-polariton condensates

H. Sigurdsson (1),O. E. Egorov (2),X. Ma (2),I. A. Shelykh (1),T. C. H. Liew (1)

(1)Nanyang Technological University (Singapore) , (2)Friedrich Schiller Universitat Jena (Germany)

We show theoretically that in a non-equilibrium system of an exciton-polariton condensate, where polaritons are generated from incoherent pumping, a ring-shaped pump allows for stationary vortex memory elements of singular topological charge. Using simple potential guides we can choose whether to copy the same charge or invert it onto another spatially separate ring pump. Such manipulation of binary information opens the possibility of a new type of processing using vortices as topologically protected memory components.
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11:05 Invited talk : Polaritons from micro to nano scale

Giovanni Lerario (1),Francesco Todisco (1),Dario Ballarini (1),Milena De Giorgi (1),Marco Esposito (1),Luisa De Marco (2),Alessandro Cannavale (2),Federica Mangione (1),Salvatore Gambino (1),Massimo Cuscuna (1),Giuseppe Gigli (1),Daniele Sanvitto (1)

(1)Istituto Nanoscienze (Italy) , (2)Istituto Italiano di Tecnologia (Italy)

Strong coupling between light and matter is at the forefront of research both for the observation of new phenomenologies and the development of technologies based on interacting fluid of light. Here we show organic polaritons in different optical systems. First we see Bloch surface wave mode dressed with excitons showing ultrafast propagation of hundreds of microns at half the speed of light. Then we shift to polaritons in plasmonic systems demonstrating ultra strong coupled excitons with nanometer-scale plasmonic disks.
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11:25 : Scattering and amplification of directed polariton beams mediated by interactions with background carriers

Johannes Schmutzler (1),Dominik Niemietz (1),Przemyslaw Lewandowski (2),Marc Abmann (1),Stefan Schumacher (2),Karol Winkler (3),Martin Kamp (3),Christian Schneider (3),Sven Hofling (3),Manfred Bayer (1)

(1)Technische Universitat Dortmund (Germany) , (2)University of Paderborn (Germany) , (3)Universitat Wurzburg (Germany)

In analogy to particle collision experiments in high energy physics, a scattering experiment of a condensed polariton beam is presented. Here, the trajectories of the scattered quasi-particles can be immediately observed allowing for the determination of interaction parameters between polaritons and background carriers. Besides guiding of polariton beams, background carriers are also considered as a gain medium. Using an attractive potential environment provided by polariton traps, a significant amplification of polariton beams is achieved without beam distortion.
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11:40 Invited talk : Transport and harvesting of excitons mediated by strong coupling

Johannes Feist, Carlos Gonzalez-Ballestero, Esteban Moreno, Francisco Garcia-Vidal

Universidad Autonoma de Madrid (Spain)

Exciton conductance in organic materials can be enhanced by several orders of magnitude under strong coupling to an electromagnetic mode. Using a 1D model system, we show how the formation of a collective polaritonic mode allows excitons to bypass the disordered molecule array and jump directly from one end of the structure to the other. We furthermore demonstrate that by tailoring the electromagnetic mode, excitons can be harvested from a specific spot and funneled to another one.
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12:00 Invited talk : Strong coupling of plasmons to dye molecules: Tailoring dispersion and emission

Thejaswi Tumkur, Guohua Zhu, Mikhail Noginov

Norfolk State University (USA)

We report on the strong coupling of surface plasmon polaritons to dye molecules in reflection, excitation, and emission experiments and demonstrated modification of the corresponding dispersion curves. We have also observed a nontrivial dispersion curve from angle-resolved spontaneous measurements, presumably resulting from a strong coupling of SPPs and spontaneously emitting dye molecules. Finally, we demonstrate the strong coupling of localized plasmons of silver islands (deposited on the top of glass, or hyperbolic metamaterials) and R6G dye molecules.
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12:20 Invited talk : Large Purcell Enhancement Using Plasmonic Nanopatch Antennas

Gleb Akselrod (1),Christos Argyropoulos (2),Thang Hoang (1),Cristian Ciraci (3),Chao Fang (1),Jiani Huang (1),David Smith (1),Maiken Mikkelsen (1)

(1)Duke University (USA) , (2)University of Nebraska-Lincoln (USA) , (3)Istituto Italiano di Tecnologia (Italy)

We demonstrate a plasmonic nanoantenna based on a film-coupled nanocube with a sub-10 nm gap embedded with emitters. Fluorescence lifetime measurements on ensembles of emitters shows Purcell factors exceeding 1000 while maintaining high quantum efficiency (>0.5) and directional emission. Using angle-resolved fluorescence measurements, we first determine the orientations of emission dipoles in the nanoscale gap. Incorporating this information along with the three-dimensional spatial distribution of dipoles into full-wave simulations predicts the time-resolved emission dynamics, in excellent agreement with experiments.
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