Abstract
The frequency range that surface plasmon polariton (SPP) mode exists is mainly limited by the metal material. With high permittivity dielectrics above metal surface, the SPP mode at high frequency has extremely large loss or can be cutoff, which limits the potential applications of SPP in the field of optical interconnection, active SPP devices and so on. To extend the frequency range of SPP mode, the surface mode guided by metal/dielectric multilayers meta-material has been studied based on the theory of electromagnetic field. It is demonstrated that surface mode not only could be supported by the meta-material but also extends the frequency to where conventional metal SPP cannot exist. Meanwhile, the characteristics of this surface mode, such as dispersion relation, frequency range, propagation loss and skin depth in meta-material and dielectrics, are also studied. It is indicated that, by varying the structure parameters, the meta-material guided SPP mode presents its advantages and flexibility over traditional metal one.
Highlights
Surface plasmon polariton (SPP) has been an attractive and extensively studied topic in the scientific community for its various unique features
SPP modes can be designed by varying the metal structure, the frequency range and propagation loss still depends on the metal material
The SPP guided by metal/dielectric multilayers meta-material was studied theoretically
Summary
Surface plasmon polariton (SPP) has been an attractive and extensively studied topic in the scientific community for its various unique features. It has shown promising applications in many fields such as highly integrated optical circuits, high sensitive biological sensing, enhancing lightmatter interaction, and so on [1,2,3,4,5,6]. One of its prominent properties is that the equivalent permittivities on different directions differ from each other and can be varied by designing its structure elaborately [10] This property promises that meta-material may serve for SPP propagating with more flexible performances than conventional metal to deal with the problems mentioned above. The study of SPP on metamaterial is mainly based on abstracted models by assuming the permittivity of the material as fixed indefinite tensors rather than functions of the specific physical structure [2], so that the conclusions are more concerned about the generality instead of pertinence
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