Abstract
We propose a plasmonic cavity using the cutoff frequency of a metal-insulator-metal (MIM) first-order waveguide mode, which has a deep subwavelength physical size of 240 × 210 × 10 (nm3) = 0.00013 λ03. The cutoff frequency is a unique property of the first-order waveguide mode and provides an effective mode gap mirror. The cutoff frequency has strong dependence on a variety of parameters including the waveguide width, insulator thickness, and insulator index. We suggest new plasmon cavities using three types of cutoff frequency modulations. The light can be confined in the cavity photonically, which is based on the spatial change of the cutoff frequency. Furthermore, we analyze cavity loss by investigating the metallic absorption, radiation, and waveguide coupling loss; the radiation loss of the higher-order cavity mode can be suppressed by multipole cancellation.
Highlights
Surface plasmon polaritons (SPPs), electron oscillations upon coupling with photons, appear at dielectric-metal interfaces by coupling with photons [1]
Suppression of the absorption loss has been widely studied by introducing high-index dielectric layers inside of low-index dielectric layers [25], radiation loss into free space has not been investigated, despite the fact that it represents a large portion of the total loss
We propose MIM cavities made by using a cutoff frequency mechanism that only appears in the dispersion relation of the first-order waveguide mode [13]
Summary
Surface plasmon polaritons (SPPs), electron oscillations upon coupling with photons, appear at dielectric-metal interfaces by coupling with photons [1]. We propose MIM cavities made by using a cutoff frequency mechanism that only appears in the dispersion relation of the first-order waveguide mode [13]. The cutoff frequency is strongly dependent on the effective size of the waveguide mode and, it can be modulated by varying the waveguide width, dielectric thickness, and index of the dielectric. The dispersion curve of the fundamental waveguide mode (black) shows a linear dependence between the frequency and the wavevector. Cutoff frequencystrongly stronglydepends depends on (w)(w) as well as the TheThe cutoff frequency on the thewaveguide waveguidewidth width as well as thickness the thickness and refractive index (n) of the dielectric material.
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