Long-infrared dual-wavelength linear-polarization-multiplexed confocal metalens based on an all-silicon dielectric

作者：Ping Xu, Xiongchao Li, Tuo Yang, Yufei Xiao, Xin Cheng, Fei Lou, Xuanming Zhang, Haixuan Huang, Xulin Zhang, Mengyu Wang, Haidong Xu, Xia Yuan · 发表于：Optics Express · 年份：2023 · DOI：10.1364/oe.494599 · 被引用次数：19 · 研究领域：Metamaterials and Metasurfaces Applications、Thermal Radiation and Cooling Technologies、Plasmonic and Surface Plasmon Research

The metalens has vast applications in biomedicine and industrial manufacturing due to their ultrathin structure and vital ability to manipulate the properties of light waves for long-infrared systems. However, it is difficult for metalens to achieve the confocal function with high focusing efficiency, wide wavelength bandwidth, and low structural complexity. Here, we propose and experimentally demonstrate an all-silicon dielectric metalens composed of arrays of minimalist meta-atoms with a single rectangular nanopillar arranged on a periodic square lattice substrate, which realizes the confocal function of the orthogonal-linear-polarized light with wavelengths of 10.6 µm and 9.3 µm, with focusing efficiencies of 64.94% and 60.03%, respectively. Also, it reveals nearly the diffraction-limited focusing performance. In addition, the metalens can realize precise long-infrared thermal imaging. Moreover, the proposed metalens is compatible with the standard complementary metal oxide semiconductor processes, which can effectively reduce the manufacturing cost and provide a feasible solution for developing planar integrated multifunctional micro-nanophotonic devices in the long-infrared field.