Abstract
Hybrid-polarization surface plasmon polaritons (HSPPs) at the interface between an isotropic medium and a one-dimensional metal–dielectric metamaterial (MM) were discussed, where the metal-layer permittivity was described with the improved Drude model. From the obtained dispersion equations, we predicated five types of HSPPs. One type is the Dyakonov-like surface polariton and another type is the tradition-like surface polarton. The others are new types of HSPPs. We establish a numerical simulation method of the attenuated total reflection (ATR) measurement to examine these HSPPs. The results from the ATR spectra are consistent with those from the dispersion equations and indicate the different polarization features of these HSPPs. The numerical results also demonstrate that the observation of each type of HSPPs requires different conditions dictated by the material parameters and the polarization direction of incident light used in the ATR spectra. These results may further widen the space of potential applications of surface plasmon polaritons.
Highlights
Surface plasmon polaritons (SPPs) in metamaterials (MMs) have attracted considerable attention for the potential applications in subwavelength optics of microscopy and lithography beyond the diffraction limit.[1,2,3,4] The SPPs originate from the coupling between the surface plasmon and electromagnetic field in artificial materials including metal or semiconductor constituents[5,6] Their great value of practical application brings about a new research field, the plasmonics.[7,8] Among MM structures, layered MMs composed of alternating metal and dielectric layers are the simplest examples
We investigated hybrid-polarization surface plasmonic polaritons (HSPPs) in a layered metaldielectric metamaterial (MM) with a transverse surface normal to the constituent layers in the long-wavelength limit
The other two are the Dyakonov-like type and the tradition-like type of Hybrid-polarization surface plasmon polaritons (HSPPs), respectively. The existence of these HSPPs is closely dependent on the properties of and the relations among the principal values of the effective permittivity and the dielectric constant of medium above the MM
Summary
Surface plasmon polaritons (SPPs) in metamaterials (MMs) have attracted considerable attention for the potential applications in subwavelength optics of microscopy and lithography beyond the diffraction limit.[1,2,3,4] The SPPs originate from the coupling between the surface plasmon and electromagnetic field in artificial materials including metal or semiconductor constituents[5,6] Their great value of practical application brings about a new research field, the plasmonics.[7,8] Among MM structures, layered MMs composed of alternating metal and dielectric layers are the simplest examples. The sub-diffraction imaging behavior in the superlen experiments was proven to originate from the hyperbolic dispersion of the HSPP (or Dyakonov plasmon),[17] where the structure of the device was reduced into the same interface structure as that used in Ref. 13. In physics, such a HSPP originates from the interface coupling of the ordinary evanescent wave in the metal substrate and the ordinary and extraordinary evanescent waves in the anisotropic dielectric, so it is a hybridized surface wave still. We will derive the dispersion equations of HSPPs within a theoretical framework similar to the Dyakonov theory[13] for convenience, and establish a numerical stimulation method of attenuated total reflection (ATR) in section III to further examine the HSPPs obtained from the dispersion equations
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