Part 1: We studied the interaction of light with various devices made from nanoslits in metal: a quarter-wave retarder, a spin-to-orbital angular momentum converter, and a vortex analyzer. Part 2:... Show morePart 1: We studied the interaction of light with various devices made from nanoslits in metal: a quarter-wave retarder, a spin-to-orbital angular momentum converter, and a vortex analyzer. Part 2: We demonstrate anomalous dispersion of surface plasmons on an aluminum surface. Show less