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We theoretically explore the possibility of reducing the propagation loss ina metal-insulator-metal (MIM) waveguide, using mode combinations to achievewall-avoiding field distributions along a certain propagation length. Wepresent analytical results for several waveguides showing notable lossreduction, and we discuss the tradeoffs between low loss and high confinementpresent in this technique.

Avoiding metallic walls: Use of modal superposition in plasmonic waveguides to reduce propagation loss