Sun Xiaohong, Huo Shuang, Yang He, Yan Mengmeng, Zhai Jianing, Zhao Saili, Zeng Yong
Henan Key Laboratory of Laser and Optoelectronic Information Technology, The School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China.
Nanomaterials (Basel). 2022 Oct 23;12(21):3720. doi: 10.3390/nano12213720.
In the propagation phase of a dielectric metasurface, there are two important problems. Firstly, the range of transmittance of the nanopillars for a building metasurface is usually between 60% and 100%, which reduces the metasurface's overall transmittance and affects the uniformity of the transmitted light. Secondly, the realistic phase provided by the nanopillar cannot be matched very well with the theoretical phase at each lattice location.The phase difference (between a realistic phase and theoretical phase) may reach tens of degrees. Here, we propose an interesting method to solve these problems. With this new method, a metalens is designed in this paper. The nanopillars for building the metalens have transmittance over 0.95, which increases the metalens transmittance and improves the light uniformity. In addition, with the new method, the phase differences of all elements in the metalens can also be reduced to be below 0.05°, decreasing the metalens spherical aberration dramatically. This method not only helps us to optimize the metalens but also provides a useful way for designing high-quality metasurfaces.
在介电超表面的传播阶段，存在两个重要问题。首先，用于构建超表面的纳米柱的透射率范围通常在60%至100%之间，这降低了超表面的整体透射率并影响透射光的均匀性。其次，纳米柱提供的实际相位在每个晶格位置与理论相位不能很好地匹配。（实际相位与理论相位之间的）相位差可能达到几十度。在此，我们提出一种有趣的方法来解决这些问题。通过这种新方法，本文设计了一种超透镜。用于构建超透镜的纳米柱的透射率超过0.95，这提高了超透镜的透射率并改善了光的均匀性。此外，采用这种新方法，超透镜中所有元件的相位差也可减小到0.05°以下，显著降低了超透镜的球差。这种方法不仅有助于我们优化超透镜，还为设计高质量超表面提供了一条有用的途径。
