论文部分内容阅读
利用三维有限时域差分(3D-FDTD)方法,研究了具有亚波长椭球形纳米孔周期性结构的金属膜的透射特性,探讨了晶格常数和孔的形状对这种结构透射特性的影响,并且通过分析电场和电磁场能量分布图,揭示了这种透射源于两种不同的共振机制:限制在椭球形孔内区域的局域波导共振模式和电磁场能量分布在椭球形孔两端的表面等离子体共振模式.
The transmission characteristics of a metal film with a periodic structure of sub-wavelength ellipsoidal nano-pores were studied by using the 3D Finite-Difference Time Domain (3D-FDTD) method. The effects of the lattice constant and the shape of the hole on the transmission characteristics of the structure were discussed. And by analyzing the energy distribution of the electric field and the electromagnetic field, it is revealed that the transmission originates from two different resonance mechanisms: the local waveguide resonance mode limited in the area of the ellipsoidal hole and the surface plasmon with the electromagnetic field energy distributed at both ends of the ellipsoidal hole Resonance mode.