介电常数近零模式与表面声子极化模式的耦合杂化研究  

Study on the Coupling Hybrid of Dielectric Constant Near Zero Mode and Surface Phonon Polarization Mode

作　　者：杨明莉 陈溢杭[1] YANG Mingli;CHEN Yihang(College of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,CHN)

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《半导体光电》2020年第4期523-526,共4页Semiconductor Optoelectronics

基　　金：广东省自然科学基金项目(2015A030311018,2017A030313035)。

摘　　要：介电常数近零模式为在纳米尺度上控制光与物质相互作用提供了新途径。利用衰减全反射原理分别激发Al2O3衬底的声子极化激元和GaN薄膜的介电常数近零模式,并且通过调整薄层厚度和优化空气层的间隙来实现双层结构模式的耦合杂化。使用传输矩阵法和有限时域差分法数值模拟计算了混合模式的电场分布和色散,结果表明两种模式由于满足强耦合条件而发生耦合劈裂。在有限时域差分法模拟的光谱中,色散关系的高频和低频分支在反交叉点都显示出强耦合,从电场图中可以观察到混合模式。混合模式具有高度传播特性和亚波长光限制的特点,可以作为未来红外和太赫兹纳米光子集成和通信设备的基础。The near-zero dielectric constant mode provides a new way to control the interaction of light and matter at the nanoscale.In this paper,the principle of attenuated total reflection was used to excite the ENZ modes of phonon polariton and gallium nitride films of aluminum oxide substrates respectively.By adjusting the film thickness and optimizing the gap between air layers,the coupling hybrid of the double-layer structure mode was achieved.The transmission matrix method and finite time domain difference method were used to numerically calculate the electric field distribution and dispersion of the mixed mode,indicating that the coupling splitting occurs in the two modes due to the strong coupling conditions.In the spectrum simulated by FDTD,both the high-frequency and low-frequency branches of the dispersion relationship show strong coupling at the anti-crosspoints,and the ENZ-SPhP mixed mode can be observed from the electric field diagram.ENZ-SPhP hybrid mode has high propagation characteristics and sub-wavelength light limitation,which can be used as the basis for future infrared and terahertz nanophotonic integration and communication equipment.

关 键 词：表面声子激元 介电常数近零 耦合 纳米光子学 模式限制 

分 类 号：O43[机械工程—光学工程]