Abstract
The ability to control resonances is crucial in advancing applications of plasmonics ranging from chemical and biological sensing at the single molecule level to on-chip communication via fully optical interconnects. To this end, a method employing an effective Hamiltonian formalism is described to study and tailor resonances of plasmonic systems at optical frequencies. Using this method, we compute the complex poles of the scattering matrix and investigate resonance dynamics of coupled plasmonic bars. We show that symmetry breaking, by tailoring near-field interactions in the whole complex plane, provides a very large degree of tunability, including a controllable negative coupling regime.
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