Li Jing, Fan Hongjie, Ye Han, Wu Tiesheng, Sun Yuhang, Wang Xueyu, Liu Yumin
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.
College of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
Nanomaterials (Basel). 2022 Jul 13;12(14):2387. doi: 10.3390/nano12142387.
Metasurfaces with both multifunctionality and tunability hold great application potential in next-generation optical devices. In this paper, we propose a stretchable metasurface composed of arrays of identical dielectric rectangular resonators embedded in the polydimethylsiloxane (PDMS) substrate. It is shown that the metasurface possesses three functions at the operating wavelength of 532 nm. The switching of functions can be implemented by changing the period of the metasurface, induced by stretching the PDMS substrate along the -direction. When the period is less than the operating wavelength of 532 nm, the behavior of metasurface can switch between transmissive window and reflective mirror. When the period of the metasurface varies from 532 nm to 700 nm, the metasurface act as a dynamic equal-power beam splitter with conversion efficiency higher than 90%, and the corresponding splitting angle can be adjusted from 90° to around 49.5°. Moreover, we achieve the switching of transmissive window/reflective mirror/split-ratio-variable splitter based on the metasurface consisting of arrays of identical L-shaped resonators embedded in the PDMS substrate.
兼具多功能性和可调谐性的超表面在下一代光学器件中具有巨大的应用潜力。在本文中，我们提出了一种由嵌入聚二甲基硅氧烷（PDMS）衬底中的相同介电矩形谐振器阵列组成的可拉伸超表面。结果表明，该超表面在532nm的工作波长下具有三种功能。通过沿-x方向拉伸PDMS衬底来改变超表面的周期，可以实现功能的切换。当周期小于532nm的工作波长时，超表面的行为可以在透射窗口和反射镜之间切换。当超表面的周期从532nm变化到700nm时，超表面充当动态等功率分束器，转换效率高于90%，并且相应的分束角可以从90°调整到约49.5°。此外，我们基于由嵌入PDMS衬底中的相同L形谐振器阵列组成的超表面实现了透射窗口/反射镜/分光比可变分束器的切换。
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