论文标题
各向异性极性异质结构的非局部散射矩阵描述
Nonlocal Scattering Matrix Description of Anisotropic Polar Heterostructures
论文作者
论文摘要
极性电介质是中红外纳米光子学的有前途的平台，可以在晶格晶格的振荡中纳米级电磁能限制。我们最近证明，在纳米极性系统中，光学响应的局部描述失败，导致对模态频率和电磁场增强的错误预测。在本文中，我们扩展了以前的工作，提供了平面，各向异性的，分层极性介电异质结构的非局部光学响应的散射矩阵理论。我们采用的形式主义允许计算反射系数和传输系数以及引导模式频谱。我们将理论应用于复杂的ALN/GAN超晶格，证明了光子和声子模式之间杂交引起的光学响应的强非局部可调性。这些计算基础的数值代码在在线存储库中提供，以作为设计基于声音的中红外光电设备的工具。
Polar dielectrics are a promising platform for mid-infrared nanophotonics, allowing for nanoscale electromagnetic energy confinement in oscillations of the crystal lattice. We recently demonstrated that in nanoscopic polar systems a local description of the optical response fails, leading to erroneous predictions of modal frequencies and electromagnetic field enhancements. In this Paper we extend our previous work providing a scattering matrix theory of the nonlocal optical response of planar, anisotropic, layered polar dielectric heterostructures. The formalism we employ allows for the calculation of both reflection and transmission coefficients, and of the guided mode spectrum. We apply our theory to complex AlN/GaN superlattices, demonstrating the strong nonlocal tuneability of the optical response arising from hybridisation between photon and phonon modes. The numerical code underlying these calculations is provided in an online repository to serve as a tool for the design of phonon-based mid-infrared optoelectronic devices.
