摘要
It is well-established that waves are inhomogeneous in a lossy isotropic medium, and the validation of the classical Snell's law is still questionable for light refraction at the dissipative and dispersive interface. With high absorption, direct experimental investigation is rather difficult due to the extremely short penetration depth; i.e., the skin depth. In this paper, a simple and unified description of this issue is proposed, which can be applied to both materials with anomalous dispersion and in the Drude region. The gradient ▽_k~ω is found to be incident angle θ_i-dependent, and the direction of the group velocity may deviate significantly from the phase velocity due to the loss induced permittivity structure. The physics behind the negative refraction effect is explained, and a novel loss induced super-prism effect is also predicted.
It is well-established that waves are inhomogeneous in a lossy isotropic medium, and the validation of the classical Snell's law is still questionable for light refraction at the dissipative and dispersive interface. With high absorption, direct experimental investigation is rather difficult due to the extremely short penetration depth; i.e., the skin depth. In this paper, a simple and unified description of this issue is proposed, which can be applied to both materials with anomalous dispersion and in the Drude region. The gradient ▽_k~ω is found to be incident angle θ_i-dependent, and the direction of the group velocity may deviate significantly from the phase velocity due to the loss induced permittivity structure. The physics behind the negative refraction effect is explained, and a novel loss induced super-prism effect is also predicted.
作者
Jian Wu
Tao Wang
Tianyue Hou
Xuefen Kan
Cheng Yin
Pu Zhou
Zhuangqi Cao
吴坚;王涛;侯天悦;阚雪芬;殷澄;周朴;曹庄琪(College of Advanced Interdisciplinary Studies, National University of Defense Technology;Hunan Provincial Key Laboratory of High Energy Laser Technology;Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University;College of Physics and Astronomy, Shanghai Jiao Tong University)
基金
Project supported by the China Postdoctoral Science Foundation(Grant No.2016M601586)
the National Natural Science Foundation of China(Grant No.11404092)
the Opening Funding of Hunan Provincial Key Laboratory of High Energy Laser Technology,China(Grant No.GNJGJS07)
