Li Ling, Zhou Zhangyu, Min Changjun, Yuan Xiaocong
Opt Lett. 2021 Jan 15;46(2):190-193. doi: 10.1364/OL.413268.
Multilayer hyperbolic metamaterials consisting of alternating metal and dielectric layers have important applications in spontaneous emission enhancement. In contrast to the conventional choice of at least dozens of layers in multilayer structures to achieve tunable Purcell effect on quantum emitters, our numerical calculations reveal that multilayers with fewer layers and thinner layers would outperform in the Purcell effect. These discoveries are attributed to the negative contributions by an increasing layer number to the imaginary part of the reflection coefficient and the stronger coupling between surface plasmon polariton modes on a thinner metal layer. This work could provide fundamental insights and a practical guide for optimizing the local density of optical states enhancement functionality of layered metamaterials.
由交替的金属层和电介质层组成的多层双曲超材料在自发辐射增强方面具有重要应用。与多层结构中通常选择至少几十层来实现对量子发射器的可调珀塞尔效应不同，我们的数值计算表明，层数更少、层更薄的多层结构在珀塞尔效应方面表现更优。这些发现归因于层数增加对反射系数虚部的负贡献以及较薄金属层上表面等离激元极化子模式之间更强的耦合。这项工作可为优化分层超材料的光学态局部密度增强功能提供基本见解和实用指南。
