Hernandez-Serrano A I, Pickwell-MacPherson Emma
Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
Sci Rep. 2021 Feb 4;11(1):3005. doi: 10.1038/s41598-021-82503-x.
In this work we demonstrate a triangular surface lens (axicon) operating at frequencies between 350 and 450 GHz using parallel-plate-waveguide technology. The proposed axicon offers longer focal depth characteristics compared to conventional plastic lenses, surpassing common TPX lenses by one order of magnitude. Additionally, due to the triangular surface of the axicon, this device is able to focus THz radiation onto smaller areas than TPX lenses, enhancing the resolution characteristics of THz imaging systems. The frequency range of operation of the proposed axicon can be easily tuned by changing the space between plates, making this approach a very attractive candidate for low-cost, robust and easy to assemble solutions for the next generation of active THz devices.
在这项工作中，我们展示了一种使用平行板波导技术在350至450千兆赫频率下工作的三角面透镜（轴锥透镜）。与传统塑料透镜相比，所提出的轴锥透镜具有更长的焦深特性，比普通的TPX透镜超出一个数量级。此外，由于轴锥透镜的三角形表面，该器件能够将太赫兹辐射聚焦到比TPX透镜更小的区域，从而增强太赫兹成像系统的分辨率特性。通过改变板间间距，可以轻松调整所提出的轴锥透镜的工作频率范围，这使得该方法成为下一代有源太赫兹器件低成本、坚固且易于组装解决方案的极具吸引力的候选方案。
