Light-trapping modes in lossy plasmonic waveguides

摘要

Light-trapping modes can exist in lossless plasmonic waveguides. Here, we investigate the effect of metallic loss on light-trapping modes using the usual complex wave vector ( β )-real frequency ( ω ) formulation and an alternative real β -complex ω formulation. It is shown that although their formation is prevented by metallic loss in the complex β -real ω formulation, light-trapping modes can exist even if there is metallic loss in the real β -complex ω formulation.