线性介质中保持对偶对称性的条件
The conditions for the preservation of duality symmetry in a linear medium
摘要：
电磁对偶对称性在真空中是很好理解的。对于通过介质传播的光，这种对称性通常被破坏。我们调查在什么条件下的对偶变换是保存在线性介质中，并采用这些条件概括的定义，光学螺旋一般线性介质。我们将讨论对偶对称介质所具有的一些独特性质，只要它们存在，并以这样一种方式重新表述麦克斯韦方程，即它们明确地显示出相反螺旋度的解耦。讨论了构造对偶对称介质的可行性。
英文摘要：
Electric magnetic duality symmetry is well understood in vacuum. For light propagating through a medium this symmetry is typically broken. We investigate under what conditions duality transformation is preserved in a linear medium and employ these conditions to generalise the definition of optical helicity to a general linear medium. We will discuss some unique properties duality symmetric media possess, provided they exist and reformulate Maxwell's equation in such a way that they explicitly show the decoupling of opposite helicities. The feasibility of constructing a duality symmetric medium is discussed.
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