Active metasurfaces based on phase transition material vanadium dioxide

Active metasurfaces based on phase transition material vanadium dioxide
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基于相变材料二氧化钒的活性超表面

DOI:
10.1007/s40843-022-2151-4
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发表时间:
2022-08
期刊:
Science China. Materials
影响因子:
--
通讯作者:
Bo Peng
Bo Peng
中科院分区:
其他
文献类型:
--
作者:
Yue Li;Jianliang Xie;Longjiang Deng;Bo Peng

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动态特性在现代光学设备中起着至关重要的作用,包括光检测和测距系统、显示设备和数码相机。与传统的体光学器件相比,有源超颖表面为动态光学系统的小型化和集成化提供了一种有吸引力的方案。相变材料由于其高对比度折射率和简单的控制特性而成为设计有源超颖表面的重要候选材料。在这里,我们提出了一个可调的超透镜和可切换的图像编码超表面在近红外区域通过控制的相变的钒氧化物。通过调节钒氧化物的相变,改变超透镜的焦点强度,并展示了强度对比度为1.12倍的开关效应。此外,在两种不同的相位状态下实现了两种不同数量的可切换成像。这项工作为实现成像和加密系统的主动元表面提供了潜在的机会。
Dynamic properties play a vital role in modern optical devices, including light detection and ranging systems, display devices, and digital cameras. Active metasurfaces provide an attractive scheme for the miniaturization and integration of dynamic optical systems compared with traditional bulk optical devices. Phase transition materials are great candidates for the design of active metasurfaces due to their high contrast refractive index and simple control characteristics. Here, we present a tunable metalens and switchable image coding metasurface in the near-infrared region through the control of the phase transition of vanadium oxide. By adjusting the phase transition of vanadium oxide, the focal intensity of the metalens is changed, and a switching effect with an intensity contrast of ∼12 times is demonstrated. In addition, the switchable imaging of two different numbers has been achieved in two different phase states. This work provides potential opportunities to realize active metasurfaces for imaging and encryption systems.
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