Mapping Magnetic Near-Field Distributions of Plasmonic Nanoantennas
ACS Nano2013Vol. 7(4), pp. 3168–3176
Citations Over TimeTop 10% of 2013 papers
Denitza Denkova, Niels Verellen, A. V. Silhanek, Ventsislav K. Valev, Pol Van Dorpe, Victor V. Moshchalkov
Abstract
We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning near-field optical microscopy (SNOM). By means of full-field simulations it is demonstrated how the coupling of the hollow-pyramid aperture probe to the nanoantenna induces an effective magnetic dipole which efficiently excites surface plasmon resonances only at lateral magnetic field maxima. This excitation in turn affects the detected light intensity enabling the visualization of the lateral magnetic near-field distribution of multiple odd and even order plasmon modes with subwavelength spatial resolution.
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