雕塑介质薄膜与各向同性介质平面界面上的Dyakonov-Tamm波理论
Theory of Dyakonov-Tamm waves at the planar interface of a sculptured nematic thin film and an isotropic dielectric material
摘要：
为了确定表面波在各向同性介质材料与周期性非均匀雕塑介质薄膜（SNTF）的平面界面上传播的条件，我们建立了一个边值问题，得到了色散方程，并进行了数值求解，得到的表面波为Dyakonov-Tamm波。由于SNTF的周期性非均匀性，由Dyakonov-Tamm波的传播方向形成的角域可以非常宽（甚至宽到允许在界面平面中的每个方向上传播）。搜索Dyakonov-Tamm波是，在目前的时间，最有前途的路线采取的实验验证的表面波传播的界面引导的两种介电材料，其中至少有一个是各向异性的。这也将有助于实现这种表面波用于光学感测渗透两种介电材料中的一种或两种的各种类型的分析物的潜力。
英文摘要：
In order to ascertain conditions for surface-wave propagation guided by the planar interface of an isotropic dielectric material and a sculptured nematic thin film (SNTF) with periodic nonhomogeneity, we formulated a boundary-value problem, obtained a dispersion equation therefrom, and numerically solved it. The surface waves obtained are Dyakonov-Tamm waves. The angular domain formed by the directions of propagation of the Dyakonov--Tamm waves can be very wide (even as wide as to allow propagation in every direction in the interface plane), because of the periodic nonhomogeneity of the SNTF. A search for Dyakonov-Tamm waves is, at the present time, the most promising route to take for experimental verification of surface-wave propagation guided by the interface of two dielectric materials, at least one of which is anisotropic. That would also assist in realizing the potential of such surface waves for optical sensing of various types of analytes infiltrating one or both of the two dielectric materials.
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