We propose a modified effective-refractive-index model for the design of relief dielectric structures on a metal surface to realize phase modulation of surface-plasmon polaritons (SPPs). In this model, the length of the dielectric structure is optimized to reach phase shifting between the SPP waves transmitted through dielectric structure and those directly propagated with the consideration of SPP losses. Specifically, a one-dimensional dielectric Fresnel zone plate is designed by employing the proposed model to demonstrate phase modulation of SPPs for the highest focusing efficiency.
© 2010 Optical Society of America
Optics at Surfaces
Original Manuscript: September 17, 2010
Revised Manuscript: November 11, 2010
Manuscript Accepted: November 14, 2010
Published: December 14, 2010
Q. Wang, J. Bu, G. H. Yuan, P. S. Tan, J. H. Teng, and X.-C. Yuan, "Deterministic relief dielectric structures to realize phase modulation of surface-plasmon polaritons," Opt. Lett. 35, 4196-4198 (2010)