标题： 偏旋介质与软-硬/DB边界条件 显示英文标题

标题： Skewon-Axion Medium and Soft-and-Hard/DB Boundary Condition

摘要： 以四维微分形式表示电磁场和介质，可以简单自然地定义斜光轴介质类。最近的研究表明，单轴斜光轴介质界面表现为DB边界，要求D矢量和B矢量的法向分量消失。本文研究了一种更一般的斜光轴介质。结果显示，这种介质的平面界面表现为边界条件，该边界条件同时推广了软硬（SH）和DB边界条件，形成了SHDB条件。研究了平面波从平面SHDB边界的反射。结果表明，对于两种本征偏振态，该边界可以用等效的PEC或PMC边界代替。理论通过数值例子进行了验证。 显示英文摘要

摘要： The class of skewon-axion media can be defined in a simple and natural manner applying four-dimensional differential-form representation of electromagnetic fields and media. It has been recently shown that an interface of a uniaxial skewon-axion medium acts as a DB boundary requiring vanishing normal components of the D and B vectors. In the present paper a more general skewon-axion medium is considered. It is shown that a planar interface of such a medium acts as a boundary generalizing both soft-and-hard (SH) and DB boundary conditions to SHDB conditions. Reflection of a plane wave from a planar SHDB boundary is studied. It is shown that for the two eigenpolarizations the boundary can be replaced by equivalent PEC or PMC boundaries. The theory is tested with a numerical example.