Author Affiliations
Abstract
Purdue University, School of Electrical and Computer Engineering, Birck Nanotechnology Center, West Lafayette, Indiana, United States
We show that dielectric waveguides formed by materials with strong optical anisotropy support electromagnetic waves that combine the properties of propagating and evanescent fields. These “ghost waves” are created in tangent bifurcations that “annihilate” pairs of positive- and negative-index modes and represent the optical analogue of the “ghost orbits” in the quantum theory of nonintegrable dynamical systems. Ghost waves can be resonantly coupled to the incident evanescent field, which then grows exponentially through the anisotropic media—as in the case of negative index materials. As ghost waves are supported by transparent dielectric media, the proposed approach to electromagnetic field enhancement is free from the “curse” of material loss that is inherent to conventional negative index composites.
photonics, biaxial materials negative index of refraction nonlinear optics Advanced Photonics
2019, 1(4): 046003
上海理工大学 光电信息与计算机工程学院,上海 200093
古斯-汉欣位移是一种反常的光学现象,当一束有限横截面积的光束在不同折射率的两种介质界面发生全反射时将产生一个侧向的位移,也就是说反射点和入射点不在同一点,此位移就称为古斯-汉欣(Goos-Hnchen,GH)位移。通过介绍近年来国内外的研究发展历程,研究了GH位移的数学推导、量子散射以及其在位移传感器、溶液浓度变化的测量等方面的实际应用。
古斯-汉欣(GH)位移 光波导 负折射率材料 传感器 量子 Goos-Hnchen (GH) shift waveguide negative index of refraction sensor quantum
电子科技大学 通信与信息工程学院,成都 610054
从负折射率媒质的本构关系出发,应用分段线性递推卷积(PLRC)方法推导出负折射率媒质中的时域有限差分(FDTD)计算公式,建立了基于分段线性递推卷积的FDTD方法(PLRC-FDTD)。并应用该方法计算了负折射率媒质覆盖导体柱的雷达散射截面,分析了负折射率媒质参数对其雷达散射截面的影响。结果表明,恰当地选择负折射率媒质参数能有效减小目标的雷达散射截面。
负折射率媒质 电磁散射 分段线性递推卷积 时域有限差分 negative index of refraction materials scattering piecewise linear recursive convolution finite-difference time-domain
根据Maxwell的电磁场理论，推导出单色平面光波入射到介电常量和磁导率分别为ε1、μ1和ε2、μ2的两种介质时的菲涅耳公式和反射率及透射率的普适表达形式．对于ε2＜0和，μ2＜0的左手材料，普适菲涅耳公式同样适用．研究了光从右手材料入射到左手材料时反射和折射的特性，给出了反射光为全偏光时布儒斯特角应满足的条件，此条件说明，在左手材料中布儒斯特角不但与折射率有关而且与磁导率有关．
物理光学 电磁场理论 左手材料 负折射率 菲涅尔公式 布儒斯特定律 Physical optics Electromagnetic field theory Left-handed materials negative index of refraction Fresnel formulae Brewster law
