Terahertz flat optics based on our originally developed low-reflection metasurface with a high refractive index can offer attractive two-dimensional optical components for the manipulation of terahertz waves. However, it remains to be shown whether a planar collimating metalens made with our original metasurface could be mounted on a resonant tunneling diode with a short distance. Here, we demonstrate that a collimating metalens with a distance of 1.0mm from the RTD enhances the directivity to 3.0 times at 0.312THz. The proposed metalens would be integrated with various terahertz continuous-wave sources for emerging industry such as 6G (beyond 5G) communications.

基于我们最初开发的具有高折射率的低反射超表面的太赫兹平面光学器件可以为操纵太赫兹波提供有吸引力的二维光学元件。然而，用我们的原始超表面制成的平面准直元透镜是否可以安装在短距离的谐振隧道二极管上仍有待证明。在这里，我们证明了距离 RTD 1.0mm 的准直元透镜在 0.312THz 处将方向性提高到 3.0 倍。拟议的超透镜将与新兴行业的各种太赫兹连续波源集成，例如 6G（超越 5G）通信。