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Within the last decade, all-dielectric nanophotonics established itself as a viable alternative for plasmonics due to lower losses and additional opportunities for light manipulation due to possibility of achieving non-unitary effective magnetic permeability. The concept of all-dielectric nanoantennas for the visible spectral range became reality with the discovery of strong scattering resonances of silicon nanospheres of 100 – 200 nm size [1, 2]. Initially, the studies of high-index nanoantennas for the visible range were mainly focused on the operation with bulk electromagnetic waves. A number of fascinating effects stemming from interference of equally strong electric and magnetic dipole resonances were discovered since then. Those are directional scattering of light [3], generalized Brewster effect [4], etc. At the same time, the performance of high-index nanoantennas in the domain of surface waves remained mostly unexplored with a few exceptions [5]. Here, we demonstrate that resonant silicon nanoparticle on metal film can act as an effective nanoantenna that converts free space light into surface plasmon polaritons. We visualize the excitation of SPP from silicon nanosphere on gold film using scanning near-field optical microscopy with aperture-type probe. In the nearfield maps measured for oblique incidence of linearly polarized laser beam on the nanosphere, the surface wave excitation is manifested due to interference with the incident wave. We show that the obtained near-field maps can be used to retrieve information on directivity of excited surface plasmon polariton and compare the SPP excitation efficiency for sand p-polarized light.

Near-field optical microscopy of surface plasmon polaritons excited by silicon nanoantenna