We present an effective generic method for manipulating energy flow in a metal–dielectric–metal plasmonic waveguide by spatially varying the thickness of the dielectric layer. To illustrate the utility of our method, we theoretically design a plasmonic convex lens and analyze its performance using full-wave numerical simulations. In particular, we show that such a lens is low dispersive and broadband.
© 2012 Optical Society of America
Optics at Surfaces
Original Manuscript: November 5, 2012
Revised Manuscript: November 16, 2012
Manuscript Accepted: November 16, 2012
Published: December 10, 2012
Weiren Zhu, Ivan D. Rukhlenko, and Malin Premaratne, "Manipulating energy flow in variable-gap plasmonic waveguides," Opt. Lett. 37, 5151-5153 (2012)