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We report on the first experimental demonstration that the microstructurebased on a dielectric cuboid combined to a thin metal film can act as anefficient plasmonic lens allowing focusing surface plasmons in a subwavelengthscale. By means of numerical simulation of surface plasmon-polariton (SPP)field intensity distributions in the microstructure, we observe a lowdivergence of plasmonic photonic jet (PPJ) and high intensity subwavelengthspots at the communication wavelength of 1530 nm. Then we fabricate anexperimental sample of the microstructure and study the SSP field intensitydistributions using the amplitude and phase-resolved scanning near-fieldoptical microscopy and demonstrate the experimental observation of the PPJeffect for the SSP waves. Such novel and simple platform can provide newpathways for plasmonics, high-resolution imaging, biophotonics as well asoptical data storage.

First experimental observation of plasmonic photonic jet based on dielectric cube