论文标题
对马克·斯托克曼（Mark Stockman）的文章的进一步评论“因因果关系的基本原则而产生的负面折射标准，而光学损失低”
Further comments on Mark Stockman's article "Criterion for Negative Refraction with Low Optical Losses from a Fundamental Principle of Causality"
论文作者
论文摘要
我们阐明了马克·斯托克曼（Mark Stockman）在论文中阐明“因果关系基本原则的低光损失标准，而光损失低的标准”。与该论文中的中心断言相反，与斯托克曼发现的基本不平等相一致的简单示例表明，在任意较大的频率窗口中可能会出现负折射和低损失。对本文的进一步研究发现了其他错误，使他的论点无效，即活动材料在频率窗口中不能低损失和负折射。同样，我们指出，对于上半部分复合频率平面中电介电常数的活性材料，由于Stockman不一定意味着非因果关系。
We clarify the claims and errors in the paper "Criterion for Negative Refraction with Low Optical Losses from a Fundamental Principle of Causality" by Mark Stockman. Contrary to the central assertion in that paper, simple examples consistent with the basic inequality which Stockman discovered show that it is possible to have negative refraction and low loss in an arbitrarily large frequency window. Further examination of the paper reveals additional errors that invalidate his argument that active materials cannot have low loss and negative refraction in a frequency window. Also, we point out that for active materials non-analyticity of the electrical permittivity in the upper half complex frequency plane does not necessarily imply noncausality, as Stockman infers.
