Guo Baoshan
Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Sci Rep. 2021 Feb 8;11(1):3313. doi: 10.1038/s41598-021-82948-0.
We proposed a method to manipulate the surface waves with a deep subwavelength metasurface by applying resonators with interfering mode resonance. The simulation results demonstrate that a single deep subwavelength obstructed groove can effectively control the propagation of surface terahertz (THz) waves by a small step increase (< 1/20 λ) of the depth or a slight change of refractive index (Δn = 0.1). The surface waves transmitted and reflected by the single groove can be controlled periodically by increasing the groove depth or refractive index with a high efficiency owing to the mode resonance between surface spoof plasmonics modes and groove cavity modes. The generated circle resonance mode provides a new idea for the development of THz devices. Importantly, the transmitted or reflected intensity of the surface wave is also enhanced by the Mode resonance. It is a simple and effective method to operate surface THz waves and manufacture more compact integrated optical devices in deep subwavelength scale.
我们提出了一种通过应用具有干涉模式共振的谐振器来利用深亚波长超表面操纵表面波的方法。模拟结果表明，单个深亚波长阻塞凹槽可以通过深度的小幅增加（<1/20λ）或折射率的轻微变化（Δn = 0.1）有效地控制表面太赫兹（THz）波的传播。由于表面类表面等离子体模式与凹槽腔模式之间的模式共振，通过增加凹槽深度或折射率，可以高效地周期性控制由单个凹槽透射和反射的表面波。所产生的圆形共振模式为太赫兹器件的发展提供了新思路。重要的是，模式共振还增强了表面波的透射或反射强度。这是一种在深亚波长尺度下操作表面太赫兹波并制造更紧凑集成光学器件的简单有效方法。
