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20 August 2020 Band structures in plasmon antenna arrays with engineered gain and loss
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We report on nonlinear eigenmode and scattering properties of lattice resonances in 2D plasmonic antenna arrays and metasurfaces coupled to spatially distributed loss and gain. Dispersive lattice resonances have already been used to realize plasmon antenna array lasers. Here we go beyond lasers and homogeneously distributed gain. We report on band structures of plasmon lattices with spatially distributed loss and gain, where we show under which conditions topological features related to PT-symmetry occur despite the fact that plasmon arrays are very far from usual tight-binding descriptions, due to dominant far-field retarded interactions. Our experimental work includes first results in which we spatially program gain and loss by shaping of pump light incident on the arrays, and ultrafast response properties probed by two-photon luminescence and interferometric autocorrelation generated in the metasurfaces.
Conference Presentation
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Radoslaw Kolkowski and A. Femius Koenderink "Band structures in plasmon antenna arrays with engineered gain and loss", Proc. SPIE 11461, Active Photonic Platforms XII, 114610T (20 August 2020);

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