Abstract
In this paper, influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide was studied by FDTD. It was observed that the resonant wavelengths of mode mj (j = 1, 2, 3) were closely related with the height H2 of InP coupling cavity. In addition, before and after the addition of air cavity, the relative farfield intensities I was a function of height H2. Therefore, InP as discrete state could be used as the filling dielectrics of Fano resonance in the MIM waveguide.
Highlights
In this paper, influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide was studied by FDTD
The distance w of the main waveguide cavity with the transparent dielectrics (n = 1.0) was set as 50 nm which was far less than the wavelength λ of incident wave so that SPPs propagation mode could be excited in MIM waveguide structure because the number of SPP modes was closely related to the distance along the wave propagation direction[27]
The resonance valley at 998 nm was regarded as third-order resonance, which was independent of the height H1 and closely related to the height H2 according to our simulations
Summary
Influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide was studied by FDTD. InP as discrete state could be used as the filling dielectrics of Fano resonance in the MIM waveguide. The MIM waveguide with coupling cavity could change its filtering performance[6,7,8,9], such as Fano resonance. Obvious Fano resonance could be observed when InP was chose as the dielectrics in the coupling cavity of MIM waveguide. InP19–25 would be used as the filling dielectrics in the MIM waveguide cavity and the influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide (Ag-Air-Ag) was explored on the basis of the literatures[22,25,26]
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