论文部分内容阅读
分析了在各向同性介质和单轴晶体界面实现负折射的最佳条件。计算发现,通过调节光轴角和各向异性参量可以使得负折射现象更为明显,获得最佳光轴角和最大入射临界角。各向异性强的晶体实现负折射的入射角范围可能会很大。讨论了单轴晶体中和负折射率介质中的负折射现象的区别:负折射率介质中的负折射是由负的折射率引起的,单轴晶体中是由于各向异性决定的。同时还发现单轴晶体中的能流负折射现象不能实现Pendry在理论上所预言的完美透镜。
The optimal conditions of negative refraction at isotropic medium and uniaxial crystal interface were analyzed. The calculated results show that the negative refraction phenomenon can be made more obvious by adjusting the parameters of optical axis and anisotropy, and the best optical axis angle and the maximum critical angle of incidence can be obtained. Anisotropically strong crystals can have a wide range of angles of incidence for negative refraction. The difference between negative refraction phenomena in uniaxial crystals and in negative refractive index media is discussed: negative refraction in a negative refractive index medium is caused by a negative refractive index, which is due to anisotropy in uniaxial crystals. It was also found that the negative refraction of energy flow in uniaxial crystals failed to achieve the perfect lens Pendry theoretically predicted.