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Imaging the Hidden Modes of Ultrathin Plasmonic Strip Antennas by Cathodoluminescence

2011; American Chemical Society; Volume: 11; Issue: 10 Linguagem: Inglês

10.1021/nl202256k

1530-6992

Edward S. Barnard, Toon Coenen, Ernst Jan R. Vesseur, Albert Polman, Mark L. Brongersma,

Advanced biosensing and bioanalysis techniques

We perform spectrally resolved cathodoluminescence (CL) imaging nanoscopy using a 30 keV electron beam to identify the resonant modes of an ultrathin (20 nm), laterally tapered plasmonic Ag nanostrip antenna. We resolve with deep-subwavelength resolution four antenna resonances (resonance orders m = 2-5) that are ascribed to surface plasmon polariton standing waves that are confined on the strip. We map the local density of states on the strip surface and show that it has contributions from symmetric and antisymmetric surface plasmon polariton modes, each with a very different mode index. This work illustrates the power of CL experiments that can visualize hidden modes that for symmetry reasons have been elusive in optical light scattering experiments.