Meng Zhen, Liu Dongqing, Pang Yongqiang, Wang Jiafu, Liu Tianwen, Jia Yan, Cheng Haifeng
National University of Defense Technology, Changsha, China.
Xi'an Jiaotong University, Xi'an, China.
Nanophotonics. 2024 May 22;13(17):3165-3174. doi: 10.1515/nanoph-2024-0202. eCollection 2024 Jul.
The demand for advanced camouflage technology is increasing in modern military warfare. Multispectral compatibility and adaptive capabilities are increasingly desired features in camouflage materials. However, due to the strong wavelength dependence and limited tunability of electromagnetic wave responses, achieving simultaneous multispectral compatibility and adaptive capability in a single structure or device remains a challenge. By integrating coding metamaterials with infrared (IR) electrochromic devices, we demonstrate a highly integrated multispectral metal-based electro-optical metadevice. The fabricated metadevices enable the reversible tunability of IR emissivity (0.58 at 3-5 µm, 0.50 at 7.5-13 µm) and wideband microwave scattering reduction (>10 dB at 10-20 GHz). The excellent integration performance is attributed to the remarkable electromagnetic control capabilities of the coding metamaterials in a chessboard-like configuration and the IR electrochromic devices based on metal reversible electrodeposition. Furthermore, the monolithic integrated design with shared barium fluoride substrate and electrodes allows the metadevices to have a simple architecture, and the careful design avoids coupling between functions. Our approach is general enough for the design of various electrochromic devices and metamaterials for multispectral camouflage, offering valuable insights for the development of advanced adaptive multispectral camouflage systems.
在现代军事战争中，对先进伪装技术的需求不断增加。多光谱兼容性和自适应能力日益成为伪装材料所期望具备的特性。然而，由于电磁波响应具有强烈的波长依赖性且可调性有限，在单一结构或器件中实现同时具备多光谱兼容性和自适应能力仍然是一项挑战。通过将编码超材料与红外（IR）电致变色器件相结合，我们展示了一种高度集成的基于金属的多光谱电光超器件。所制备的超器件能够实现红外发射率的可逆调谐（在3 - 5微米处为0.58，在7.5 - 13微米处为0.50）以及宽带微波散射减少（在10 - 20吉赫兹处大于10分贝）。这种优异的集成性能归因于棋盘状配置的编码超材料以及基于金属可逆电沉积的红外电致变色器件所具有的卓越电磁控制能力。此外，采用共享氟化钡衬底和电极的单片集成设计使超器件具有简单的架构，并且精心的设计避免了功能之间的耦合。我们的方法对于设计用于多光谱伪装的各种电致变色器件和超材料具有足够的通用性，为先进的自适应多光谱伪装系统的发展提供了有价值的见解。
