Femtosecond laser fabrication metasurface emitter for multispectral camouflage.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-05-01 DOI:10.1364/OL.555960

Mengdan Qian, Junlong Yuan, Shuwen Zheng, Yue Liu, Yufang Liu, Kun Yu

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引用次数: 0

Abstract

The powerful electromagnetic capability of a metasurface makes it a good candidate for thermal emission manipulation toward promising infrared (IR) camouflage and thermal management technology. Here, a metasurface-based infrared is fabricated to achieve multispectral camouflage as well as radiative cooling simultaneously. Cross-scale processing on metal-dielectric composite films is successfully achieved by femtosecond laser direct writing (FsLDW), which is proven to be an efficient and feasible technique in metasurface fabrication. The prepared emitter exhibits low emissivity (ɛ_3-5 _μm= 0.32, ɛ_8-14 _μm= 0.31) in atmospheric windows but high absorption in 10.6 μm so that it can effectively evade the tracking of infrared detectors and laser radars. Besides, the emitter also has high emissivity in the undetected band (_ɛ5-8 _μm= 0.66) to dissipate possible heat accumulation. The proposed metasurface design and fabrication method empowers new ideas for the generation of optical devices toward multispectral camouflage and radiative cooling compatibility.

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飞秒激光制造多光谱伪装超表面发射器。

超表面强大的电磁性能使其成为红外伪装和热管理技术的热发射操纵的良好候选者。在这里，制作了一个基于超表面的红外线，以实现多光谱伪装和辐射冷却同时进行。利用飞秒激光直接写入技术（FsLDW）成功地实现了金属-介电复合薄膜的跨尺度加工，是一种高效可行的超表面加工技术。所制备的发射体在大气窗口内具有较低的发射率（ε 3 ~ 5 μm = 0.32, ε 8 ~ 14 μm = 0.31），而在大气窗口10.6 μm内具有较高的吸收率，可以有效地逃避红外探测器和激光雷达的跟踪。此外，该发射器在未探测波段具有较高的发射率（ε 5 ~ 8 μm = 0.66），以驱散可能的热量积累。提出的超表面设计和制造方法为多光谱伪装和辐射冷却兼容性的光学器件的产生提供了新的思路。

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.