Zhu Shan, Cao Yanyan, Fu Yangyang, Gao Lei, Li Xiaochao, Chen Huanyang, Xu Yadong
Opt Lett. 2020 Feb 1;45(3):652-655. doi: 10.1364/OL.378826.
In this work, by engineering a dielectric layer with gradient thickness in a circular waveguide, we present a simple method of realizing a 3D broadband waveguide cloak at terahertz regime. It is numerically shown that such a proposed device exhibits nearly perfect cloaking performance with a broadband response for transverse electric polarization, and the working mechanism behind the waveguide cloaking is attributed to dynamic evolution of the guided mode. Distinct from all previous cloaks using transformation optics, our proposed cloak scheme only requires isotropic dielectric material and therefore is much easier to implement, which enables more superiorities in potential applications.
在这项工作中，通过在圆形波导中设计具有梯度厚度的电介质层，我们提出了一种在太赫兹频段实现三维宽带波导隐身衣的简单方法。数值结果表明，这种提出的器件在横向电极化下具有近乎完美的隐身性能和宽带响应，波导隐身背后的工作机制归因于导模的动态演化。与以往所有使用变换光学的隐身衣不同，我们提出的隐身衣方案只需要各向同性的电介质材料，因此更容易实现，这在潜在应用中具有更多优势。
