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Here, we demonstrate a simple direct maskless laser-based approach forfabrication of back-reflector-coupled plasmonic nanorings arrays. The approachis based on delicate ablation of an upper metal film of a metal-insulator-metal(MIM) sandwich with donut-shaped laser pulses followed by argon ion-beampolishing. After being excited with a radially polarized beam, the as-preparedMIM configuration of the nanorings permitted to realize efficient nanofocusingof constructively interfering plasmonic waves excited in the gap area betweenthe nanoring and back-reflector mirror. For optimized geometric parameters ofsuch MIM structure, substantial enhancement of the electromagnetic near-fieldsat the center of the ring within a single focal spot with the size of0.37$\lambda^{2}$ can be achieved, which is confirmed by Finite Difference TimeDomain (FDTD) calculations, as well as by detection of enhanced PL signal fromadsorbed organic dye molecules. The simple large-scale and cost-efficientfabrication procedure used, along with relatively good tolerance to excitationbeam misalignment, make the proposed structures promising for realization ofvarious nanophotonic and biosensing platforms that utilize cylindrical vectorbeam as a pump source.

Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications