Energy-Momentum Cathodoluminescence Imaging of Anisotropic Directionality in Elliptical Aluminium Plasmonic Bullseye Antennas

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DOI http://dx.doi.org/10.1021/acsphotonics.8b01711
Reference T. Coenen and A. Polman, Energy-Momentum Cathodoluminescence Imaging of Anisotropic Directionality in Elliptical Aluminium Plasmonic Bullseye Antennas, ACS Photonics 6, 2: 573-580 (2019)
Group Photonic Materials

We show that geometric eccentricity can be used to strongly tailor the angular radiation profiles of aluminium plasmonic bullseye antennas. High-resolution energy/momentum maps are recorded using a novel cathodoluminescence Fourier imaging technique. The angular profiles for elliptical bullseyes (ellipticity e = 0, 0.6, 0.8) are well described by a 2D dipole scattering model in which the phase and amplitude of the scattering from the bullseye grooves dictates the angular profile at a given energy. We show that geometric eccentricity is an important parameter to control the radiation profile of bullseye antennas. The new energy-momentum cathodoluminescence imaging technique can be used to map the optical properties of a wide range of dispersive and anisotropic systems, paving the way for a broad range of studies on complex nanophotonic systems.