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A type of Tamm states inside metal-insulator-metal (MIM) waveguides isproposed. An impedance based transfer matrix method is adopted to study andoptimize it. With the participation of the plasmonic Tamm states, fields couldbe enhanced twice: the ffirst is due to the coupling between a normal waveguideand a nanoscaled plasmonic waveguide and the second is due to the stronglocalization and field enhancement of Tamm states. As shown in our 2D couplingconfiguration, |E|^2 is enhanced up to 1050 times when 1550 nm light is coupledfrom an 300 nm Si slab waveguide into an 40 nm MIM waveguide.

Plasmonic Tamm states: second enhancement of light inside the plasmonic waveguide