title: Surface-plasmon holographic beam shaping.
abstract: Surface plasmon polaritons and free-space beams are often coupled through periodic gratings. Here we show that by employing holographic-based techniques for modulating the grating, one can systematically control the amplitude and phase of the free-space beam. Alternatively, arbitrarily shaped surface plasmon can be generated. By using gratings with different periods for the input and output coupling, we obtain a planar beam transformer, whose resonance angles are related through a generalized form of the Bragg law. Specifically, we demonstrate the coupling of surface plasmon polaritons into focused free-space beams, as well as into accelerating Airy beams and vortex beams.
authors.affiliation: Department of Physical Electronics, Fleischman Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel.
authors.forename: Ido
authors.initials: I
authors.lastname: Dolev
authors.forename: Itai
authors.initials: I
authors.lastname: Epstein
authors.forename: Ady
authors.initials: A
authors.lastname: Arie