Mapping Magnetic Near-Field Distributions of Plasmonic Nanoantennas

作者：Denkova Denitza^*; Verellen Niels; Silhanek Alejandro V; Valev Ventsislav K; Van Dorpe Pol; Moshchalkov Victor V

来源：ACS Nano, 2013, 7(4): 3168-3176.

DOI：10.1021/nn305589t

• optical magnetic field
• near-field imaging
• surface plasmon resonance
• optical nanobar antenna
• hollow-pyramid probe
• probe-sample coupling

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.

• 出版日期2013-4