单负超透镜零折射性质的数值模拟验证

Numerical Demonstration of the Zero-Refraction Properties of Single Negative Superlens

为了验证单负材料的零折射理论,设计了一个简单装置.先利用金属表面等离子体的反常透射特性使金属缝成为一个二维点光源,再放置一个单负薄膜作为超透镜来观察透射图像.时域有限差分方法的模拟结果与零折射理论的预期一致,从而给出了一个直观的零折射例证.

To validate the zero-refraction theory of the single negative materials, a simple device is proposed, in which a metal slit is illuminated from one side and a two-dimensional light source can be formed on the other side along the slit as the extraordinary transmission assisted by the surface plasmon polaritons; a single-negative superlens is set before the light source to perform the transmission patterns. The transmission patterns obtained by FDTD （Finite Difference Time Domain ） simulation method agree with the expectation of the zero-refraction theory well. This result presents an intuitive demonstration of the zero-refraction theory.