All-dielectric orthogonal doublet cylindrical metalens in long-wave infrared regions
Xiaoyan Shi, Dejia Meng, Zheng Qin, Qiong He, Shulin Sun, Lei Zhou, David R. Smith, Qing Liu, Tarik Bourouina, Zhongzhu Liang
Abstract
Metalens have been recently introduced to overcome shortcomings of traditional lenses and optical systems, such as large volume and complicated assembly. As a proof-of-principle demonstration, we design an all-dielectric converging cylindrical metalens (CML) for working in long-wave infrared regions around 9 µm, which is made up of silicon-pillar on MgF 2 dielectric layer. We further demonstrate the focusing effect of an orthogonal doublet cylindrical metalens (ODCM). Two CMLs are combined orthogonally and a circular focusing spot was demonstrated. This proves that within a certain size range, the focusing effect achieved by the ODCM is similar to that of a traditional circular metalens.