Abstract

We propose a novel type of nanoscaled Tamm states for light enhancement by introducing a Bragg reflector (BR) in a nanoscaled metal-insulator-metal (MIM) waveguide, which we call plasmonic Tamm states (PTSs). Due to PTS effects, fields can be enhanced for a second time at the terminal side of the MIM BR on the basis of the dimension confinement. The enhancement of ${|E|}^2$ is up to 1050-fold for light of 1550 nm, as shown in our 2D focusing configuration. Structural design and optimizations are performed by an impedance-based transfer matrix method and are further confirmed by a finite element method.

© 2014 Optical Society of America

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