2019-02-28
Energy-Momentum Cathodoluminescence Imaging of Anisotropic Directionality in Elliptical Aluminium Plasmonic Bullseye Antennas
Publication
Publication
ACS Photonics , Volume 6 - Issue 2 p. 573- 580
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.
| Additional Metadata | |
|---|---|
| ACS | |
| The Netherlands Organisation for Scientific Research (NWO) , European Research Council (ERC) | |
| doi.org/10.1021/acsphotonics.8b01711 | |
| ACS Photonics | |
| Organisation | Photonic Materials |
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Coenen, T., & Polman, A. (2019). Energy-Momentum Cathodoluminescence Imaging of Anisotropic Directionality in Elliptical Aluminium Plasmonic Bullseye Antennas. ACS Photonics, 6(2), 573–580. doi:10.1021/acsphotonics.8b01711 |
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