论文标题
单轴各向异性纳米多孔氧化铝膜的贝尔曼模式的实验性观察
Experimental observation of Berreman modes in uniaxial anisotropic nanoporous alumina film on aluminium substrate
论文作者
论文摘要
在本文中，我们通过实验和数字验证了贝尔曼模式的激发，这些模式在铝制底物上生长的单轴各向异性纳米氧化铝的介电膜中传播。它是一种空气二电 - 金属不对称的极性系统，其有效介电常数的实际部分具有接近零的值。模式在比零波长区域附近的Epsilon低的波长处激发。观察到中红外P极光的最小反射，而对于S偏振光，观察到最大反射。实验结果是针对P和S极光的数值再现的，并确认了系统中的贝尔曼模式的激发。在令人兴奋的波长下，该场局限于空气界面界面附近的介电区域。报告的系统很简单，可以很容易地在大规模上制造，并且有助于各种中红外应用，例如热管理系统，传感器，被动辐射冷却设备，非线性应用程序和Terahertz频率产生。
In this article, we demonstrate experimentally and verified numerically the excitation of Berreman modes that propagate in a dielectric film of uniaxial anisotropic nanoporous alumina grown on an aluminium substrate. It is an air-dielectric-metal asymmetric polaritonic system with a real part of the effective permittivity having a value near zero. The modes are excited at a wavelength lower than the epsilon near zero wavelength region. Minimum reflection is observed for the mid-infrared p-polarized light, while maximum reflection is observed for the s-polarized light. The experimental results are numerically reproduced for both p- and s-polarized light and confirm the Berreman modes excitation in the system. At the exciting wavelength, the field is confined in the dielectric region near the air-dielectric interface. The reported system is straightforward and could be easily fabricated over a large scale and is helpful in a variety of mid-infrared applications such as thermal management systems, sensors, passive radiative cooling devices, non-linear applications, and terahertz frequency generation.
