Backward propagating slow light in inverted plasmonic taper.
The negative dispersion of the TM1 mode of a thin plasmonic gap, occurring at frequencies exceeding the surface plasmon frequency, is assigned by causality to be a backward wave. This negative index mode, is also slow-light--having small positive group velocity and is exhibiting inverse geometrical cutoff characteristics--namely when the gap width is enhanced.
Feigenbaum
Eyal
E
EE Department, Technion, Haifa 32000, Israel.
Orenstein
Meir
M
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*