Making use of a rigorous electromagnetic treatment, we demonstrate that the approximate results that are customarily employed for the analysis of a plasmon field at a metal/dielectric boundary are incorrect even in some situations in which they are supposed to hold. We show further that a new type of surface-plasmon solution exists that does not follow from the standard approximate analysis. Energy-flow considerations indicate that the new polariton is a backward-propagating surface wave, as encountered in manmade structures. Our results are likely to find applications in metal/semiconductor and metamaterial plasmonics.
© 2013 Optical Society of America
Original Manuscript: February 8, 2013
Revised Manuscript: February 25, 2013
Manuscript Accepted: February 25, 2013
Published: March 26, 2013
Andreas Norrman, Tero Setälä, and Ari T. Friberg, "Exact surface-plasmon polariton solutions at a lossy interface," Opt. Lett. 38, 1119-1121 (2013)