Nonlinear surface waves near the Dirac point in negative–zero–positive index metamaterial
Nonlinear surface waves near the Dirac point in negative–zero–positive index metamaterial
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DOI：
10.1088/2040-8978/12/8/085201
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发表时间：
2010-08
影响因子：
2.1
通讯作者：
M. Shen;Lin-Xu Ruan;Xiangshan Chen;Xiangshan Chen;Jie-long Shi;H. Ding;N. Xi;Qi Wang
中科院分区：
文献类型：
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作者：
M. Shen;Lin-Xu Ruan;Xiangshan Chen;Xiangshan Chen;Jie-long Shi;H. Ding;N. Xi;Qi Wang
受负-零-正折射率异向介质（NZPIM）中光场双锥结构Dirac点（DP）的实现启发，研究了非线性介质与NZPIM之间单一界面上的非线性表面波.研究发现，在DP附近，非线性表面波存在一个禁带，非线性表面波也存在一个频率阈值。与NZPIM在某些频率区域的负磁导率相反，我们证明了非线性表面波总是向前的，具有正的功率通量。对表面波的频率特性、群速度和功率通量也作了详细的讨论。这些结果在导波光学和光学器件中具有潜在的应用价值。
Motivated by the realization of the Dirac point (DP) with a double-cone structure for the optical field in a negative–zero–positive index metamaterial (NZPIM), we study the nonlinear surface waves localized at the single interface separating a nonlinear conventional dielectric medium and a NZPIM. It is found that, near the DP, there is a forbidden band for the nonlinear surface waves and the nonlinear surface waves also have a frequency threshold. In contrast to the negative permeability of NZPIM in some frequency regions, we show that the nonlinear surface waves are always forward with positive power fluxes. The frequency property, the group velocity and the power flux of the surface waves are also discussed in detail. These results may have potential applications in guided wave optics and optical devices.