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Abstract: We investigate a plasmonic waveguide system using a 2-dimension finite element method, which consists of a metal-insulator-metal waveguide coupled with a stub resonator and a baffle. Numerical simulations results show that the sharp and asymmetric Fano-line shapes can be created by placing a baffle into the waveguide, and the main dependent factors of Fano-like spectra response are discussed. Based on the above results, we design three kinds of plasmonic waveguides with possible applications in wavelength demultiplexing. An analytic model based on the transfer matrix formalism is utilized to describe and explain this phenomenon. These results could be applied for developing ultra-compact wavelength division multiplexing devices in highly all-optical integration system. [Copyright &y& Elsevier]

In this paper, the strong exciton–plasmon couplings dependent on two localized modes are numerically and theoretically investigated in cuboid dielectric–metal core–shell resonators. For different resonance wavelengths, the electric fields of different modes can be highly localized in the dielectric gap layer, bringing about very small mode volumes. Through the active control of core–shell cavity parameters, the Rabi splitting and the anti-crossing dispersion are observed in the extinction spectrum, confirming the realization of strong coupling Both the multimode interference coupled mode theory and the Bloch equation are applied to explain the strong coupling in this system. After replacing the shell metal from silver to gold, the large red shift of resonance peaks exactly makes the high order mode strongly coupled with the same J-aggregate molecules, thus inducing slight spatial changes and reducing the required minimum number of the coupled excitons. [ABSTRACT FROM AUTHOR]