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We report on the fabrication of plasmonic hybrid sensors made of a micro-axicon dielectric lens and a single metal nanoparticle. The dielectric lens produces a Bessel-like beam of light at its apex under plane wave excitation confining light in a narrow and intense beam with a low divergence. This Bessel-like beam can be used to optimize efficiently the excitation of a plasmonic nano-object and the collection of its far-field signal. This hybrid structure using the optical properties of a single metal nanoparticle can act as a highly sensitive plasmonic nanosensor.

metal nanoparticle; LSPR; sensing; axicon lens