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Open quantum systems consisting of coupled bound and continuum states havebeen studied in a variety of physical systems, particularly within the scope ofnuclear, atomic and molecular physics. In the open systems, the effects of thecontinuum decay channels are accounted for by indirect non-Hermitian couplingsamong the quasi-bound states. Here we explore anti-Hermitian coupling in aplasmonic system for spatially manipulating light on the nano-scale. We showthat by utilizing the anti-Hermitian coupling, plasmonic antennas closelypacked within only {\lambda}/15 separations can be individually excited fromthe far field, which are otherwise indistinguishable from each other.

Plasmonic Anti-Hermitian Coupling for Controlling Light at the Nanoscale