周期层状介质中的斜冻结模
Oblique frozen modes in periodic layered media
摘要：
研究了平面电磁波入射到含有各向异性介质层的半无限周期分层介质表面的经典散射问题。我们证明了斜入射光在进入周期板后，会转变为具有极大振幅和零群速度法向分量的反常掠射模。这种模式不能表示为扩展和倏逝贡献的叠加。相反，它是一个一般的（非布洛赫）Floquet本征模的振幅发散线性与距离板边界。值得注意的是，在这种情况下的板反射率可以非常低，这意味着入射光几乎100%转换成轴向冻结模式，其中电磁能量密度超过入射波的电磁能量密度几个数量级。该效果可以在任何期望的频率下实现，包括光学和UV频率范围。唯一基本的物理要求是存在具有适当的各向异性轴倾斜取向的电介质层。这一现象的一些实际方面被认为是。
英文摘要：
We study the classical scattering problem of a plane electromagnetic wave incident on the surface of semi-infinite periodic stratified media incorporating anisotropic dielectric layers with special oblique orientation of the anisotropy axes. We demonstrate that an obliquely incident light, upon entering the periodic slab, gets converted into an abnormal grazing mode with huge amplitude and zero normal component of the group velocity. This mode cannot be represented as a superposition of extended and evanescent contributions. Instead, it is related to a general (non-Bloch) Floquet eigenmode with the amplitude diverging linearly with the distance from the slab boundary. Remarkably, the slab reflectivity in such a situation can be very low, which means an almost 100% conversion of the incident light into the axially frozen mode with the electromagnetic energy density exceeding that of the incident wave by several orders of magnitude. The effect can be realized at any desirable frequency, including optical and UV frequency range. The only essential physical requirement is the presence of dielectric layers with proper oblique orientation of the anisotropy axes. Some practical aspects of this phenomenon are considered.
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