Opt Express. 2023 Feb 27;31(5):8650-8667. doi: 10.1364/OE.484288.
Multispectral stealth technology including terahertz (THz) band will play an increasingly important role in modern military and civil applications. Here, based on the concept of modularization design, two kinds of flexible and transparent metadevices were fabricated for multispectral stealth, covering the visible, infrared (IR), THz, and microwave bands. First, three basic functional blocks for IR, THz, and microwave stealth are designed and fabricated by using flexible and transparent films. And then, via modular assembling, that is, by adding or removing some stealth functional blocks or constituent layers, two multispectral stealth metadevices are readily achieved. Metadevice 1 exhibits THz-microwave dual-band broadband absorption, with average measured absorptivity of 85% in 0.3-1.2 THz and higher than 90% in 9.1-25.1 GHz, suitable for THz-microwave bi-stealth. Metadevice 2 is for IR and microwave bi-stealth, with measured absorptivity higher than 90% in 9.7-27.3 GHz and low emissivity around 0.31 in 8-14 µm. Both metadevices are optically transparent and able to maintain good stealth ability under curved and conformal conditions. Our work offers an alternative approach for designing and fabricating flexible transparent metadevices for multispectral stealth, especially for applications in nonplanar surfaces.
多光谱隐形技术包括太赫兹（THz）波段将在现代军事和民用应用中发挥越来越重要的作用。在这里，基于模块化设计的概念，我们制造了两种灵活透明的超材料器件，用于多光谱隐形，涵盖可见光、红外（IR）、THz 和微波波段。首先，通过设计和制造三种基本的 IR、THz 和微波隐形功能块，使用灵活透明的薄膜。然后，通过模块化组装，即添加或去除一些隐形功能块或组成层，我们可以轻松实现两种多光谱隐形超材料器件。器件 1 表现出 THz-微波双带宽带吸收，在 0.3-1.2 THz 范围内的平均测量吸收率为 85%，在 9.1-25.1 GHz 范围内的吸收率高于 90%，适用于 THz-微波双隐形。器件 2 用于红外和微波双隐形，在 9.7-27.3 GHz 范围内的测量吸收率高于 90%，在 8-14 µm 范围内的发射率低至 0.31。这两种超材料器件都具有光学透明性，并能在弯曲和共形条件下保持良好的隐形能力。我们的工作为设计和制造多光谱隐形的灵活透明超材料器件提供了一种替代方法，特别是在非平面表面的应用。
