Yu Yiting, Wang Ping, Zhu Yechuan, Diao Jinshuai
Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an, 710072, China.
Key Laboratory of Micro- and Nano-Electro-Mechanical Systems of Shaanxi Province, Northwestern Polytechnical University, Xi'an, 710072, China.
Nanoscale Res Lett. 2016 Dec;11(1):109. doi: 10.1186/s11671-016-1333-9. Epub 2016 Feb 27.
The microlens arrays (MLAs) are widely utilized for various applications. However, when the lens size and the spacing between two adjacent microlenses are of the length scale of the working wavelength, the diffraction effect plays a vital role in the final focusing performance. We suggest a kind of broadband metallic planar microlenses, based on which the ultra-compact microlens arrays are also constructed. The focusing coupling effect revealing for such devices is then investigated in detail by using the finite-difference time-domain (FDTD) method, with the emphasis on the changing spacing between adjacent microlenses, the working wavelength, the diameter of microlenses, and the array size. The results show that a larger spacing, a larger lens size, a shorter wavelength, or a smaller array scale can lead to a weaker focusing coupling effect. This research provides an important technological reference to design an array of metallic planar microlenses with the well-controlled focusing performance.
微透镜阵列（MLA）被广泛应用于各种领域。然而，当透镜尺寸和两个相邻微透镜之间的间距处于工作波长的长度尺度时，衍射效应在最终聚焦性能中起着至关重要的作用。我们提出了一种宽带金属平面微透镜，并在此基础上构建了超紧凑微透镜阵列。然后，通过时域有限差分（FDTD）方法详细研究了此类器件的聚焦耦合效应，重点关注相邻微透镜之间间距的变化、工作波长、微透镜直径和阵列尺寸。结果表明，较大的间距、较大的透镜尺寸、较短的波长或较小的阵列尺度会导致较弱的聚焦耦合效应。本研究为设计具有良好聚焦性能控制的金属平面微透镜阵列提供了重要的技术参考。
