Compact generation of surface plasmon polariton Bessel-like beams

Plasmonic Bessel-like beams have potential applications in nanophotonics, particularly in photonic circuits, micro manipulations, and near field-optical trapping. However, the existing methods all require an axicon-shaped or X-shaped slit array, which not only occupies a large space, but also affects the beam coverage range. In this paper, one compact strategy using two straight columns of nanoslits is proposed to generate a Bessel beam on the two sides. Bessel beams of different orders and tilted angles can be simply achieved using double slit arrays.