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Optical transparent metamaterial emitter with multiband compatible camouflage based on femtosecond laser processing
Shu-Wen Zheng1, Xiu-Yu Chen1, Jin-Long Huang1
1Hennan Key Laboratory of Infrared Spectrum Measures and Applications, School of Physics, Henan Normal University, Xinxiang, Henan 453007, China.
Nanophotonics (Berlin, Germany)
|March 31, 2025
Summary
This study introduces a flexible, mask-free laser writing technique to create metamaterial emitters for advanced infrared (IR) camouflage. The developed emitters offer multiband stealth capabilities and effective thermal management for military applications.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Infrared (IR) camouflage is crucial due to advancements in IR detection technology.
- Metamaterials offer potential for IR camouflage through electromagnetic field regulation.
- Current metamaterial fabrication is complex, limiting practical use, and single-band camouflage is insufficient against multiband detection.
Purpose of the Study:
- To develop a flexible, mask-free fabrication technique for IR camouflage metamaterials.
- To create an optically transparent metamaterial emitter with multiband camouflage capabilities.
- To demonstrate effective thermal management for enhanced camouflage applications.
Main Methods:
- Utilized flexible, fine, and mask-free femtosecond laser direct writing (FsLDW) technology.
- Patterned ultra-thin metals to create metamaterial structures.
- Fabricated an optically transparent metamaterial emitter.
Main Results:
- Achieved high reflectance in dual-band atmospheric windows (3-5 µm and 8-14 µm).
- Demonstrated low reflectance for IR and laser stealth (1.06 µm and 1.55 µm).
- Exhibited high emissivity in the 5-8 µm non-atmospheric window for heat dissipation, outperforming silver in radiative cooling.
Conclusions:
- FsLDW enables efficient fabrication of multiband IR camouflage metamaterials.
- The developed emitter provides effective camouflage across multiple IR bands and laser wavelengths.
- This technology offers a promising solution for military camouflage and thermal management through coordinated control of electromagnetic waves and heat.
