含负折射率层的多层体系的反常光子隧穿

研究了多层体系含负折射率层的光学传输特性，通过传输矩阵方法，给出了体系透射率的一般表达式，并讨论了含负折射率层的四层结构在入射角大于临界角时的反常光子隧穿现象。当体系参量完全匹配时，对于任意入射光波长及大于临界角的入射，透射率均为1；仅衬底层不匹配时，对于给定的衬底参量，透射率和入射波长无关，仅和入射角相关。对于TM波，存在多层体系的布儒斯特角，使得透射率等于1。对于TE波则没有类似现象；在衬底不匹配的情况下，提高出射端的折射率将增加体系的透射率；中间层的厚度或者折射率不匹配时，透射率关于匹配位置对称分布且随着失谐的增加指数衰减，随着入射角的增加，衰减速度加快。

Unusual Photonic Tunneling in Multilayer System with a Negative Refraction Index Layer

The optical character of the multiplayer system with a negative refractive index layer is investigated.By means of a transfer matrix method,the exact analytical expression of transmissivity has been derived.Unusual photonic tunneling in the multilayer system with a negative refraction index layer has been analyzed.For all frequency and incident angle,if all parameter are matching,the transmittance reaches unity.When only the backdrop is not matching,the transmittance is independent of the incident wavelength,but depends on the incident angle.For the TM wave,there is a special angle,known as Brewster's angle,with which the transmittance reaches unity,and a larger refractive index of the end will enlarge the transmittance.When the thickness or the refractive index of the medial layer is mismatching,the transmittance distributed symmetrically about the mismatching position decays with the increase of the disharmony,and there appears a faster decay when the incident angle increases.