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The possibility of material design technology to obtain negative refractive indices poses the question on the optical properties of aspherical surfaces made from such media. Here, the special aspherical surfaces connected with Cartesian ovaloides are discussed in the case of a negative refractive index. A subset of the Cartesian ovaloides contains spheres which allow aplanatic imaging in the well-known kind. A sign change of the refractive index shows changes in the virtual character of the aplanatic images. 相似文献
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采用2点及3点Stigmatic points方法设计阵列波导光栅(AWG)器件,对传统的Rowland圆结构设计做了改进。比较分析了传统设计和改进设计AWG器件的像差,讨论了阵列波导的接收孔径及输入光信号的等效高斯光束发散角对AWG器件性能的影响。指出了传统的Rowland圆结构设计在设计高通道数AWG器件时存在的边缘通道性能劣化问题,采用多点Stigmatic points方法设计能很好地解决这一问题。 相似文献
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