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In this work, the scattering of surface plasmons by a finite periodic arrayof one-dimensional grooves is theoretically analyzed by means of a modalexpansion technique. We have found that the geometrical parameters of the arraycan be properly tuned to achieve optimal performance of the structure either asa Bragg reflector or as a converter of surface plasmons into light. In thislast case, the emitted light is collimated within a few degrees cone.Importantly, we also show that a small number of indentations in the array aresufficient to fully achieve its functional capabilities.Comment: 5 pages, 5 figures; changed sign convention in some definition

Scattering of surface plasmons by one-dimensional periodic nanoindented surfaces