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Enhancing the efficiency of slit-coupling to surface-plasmon-polaritons via dispersion engineering
We describe a simple method for enhancing the efficiency of coupling from a free-space transverse-magnetic (TM) plane-wave mode into a surface-plasmon-polariton (SPP) mode. The coupling structure consists a metal film with a dielectric-filled slit and a planar, dielectric layer on the slit-exit side of the metal film. By varying the dielectric layer thickness, the wavevector of the SPP mode on the metal surface can be tuned to match the wavevector magnitude of the modes emanating from the slitdoi:10.1364/oe.18.018206 pmid:20721210 fatcat:s3im67funnfu3g4xm54dsjcyte