Summary
International Symposium on Antennas and Propagation
2009
Session Number:2A3
Session:
Number:2A3-3
A Metamaterial Structure Composed of Wire Mesh with Conducting Sphere and Its Application to Surface Plasmon
Yujiro KUSHIYAMA, Toru UNO, Takuji ARIMA,
pp.313-316
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
In recent years, the metamaterial technologies have been developed in fields of antenna and microwave engineerings. The metamaterial is a general term for materials which indicate electric properties that may not be found in nature (i.e., negative refraction index), and is usually realized by using artificial periodic structures. One of which is a three?dimensional conducting wire mesh structure. The electric property of the this structure can basically be modeled by a homogeneous medium which indicates Drude dispersion [1], and the permittivity becomes negative in the frequency range lower than a plasma frequency. Therefore, this structure has some potential for supporting surface plasmon polaritons(SPPs). The SPPs propagate at an interface between two materials having oppositely signed permittivity. Since the wave length of the SPP is smaller than that of an incident wave [2], it may be applied for sensing and imaging. However, the dispersive relation of the wire mesh structure indicates anisotropic property [3], [4]. In this paper, we propose a new metamaterial structure which realize an isotropic property. The proposed structure consists of wire mesh with a conducting sphere. The dispersion relations are confirmed by computing the reflection coefficients from the structure in Kretschmann geometry.