Multispectral metal-based electro-optical metadevices with infrared reversible tunability and microwave scattering...

Area of Science:

• Materials Science
• Optoelectronics
• Military Technology

Background:

• Modern military operations require advanced camouflage solutions with multispectral compatibility and adaptive capabilities.
• Existing camouflage materials face challenges in achieving simultaneous multispectral response and tunability due to wavelength dependence.
• Developing integrated devices for adaptive multispectral camouflage is a significant technological hurdle.

Purpose of the Study:

• To demonstrate a highly integrated multispectral metal-based electro-optical metadevice for adaptive camouflage.
• To achieve simultaneous tunable infrared emissivity and wideband microwave scattering reduction in a single device.
• To provide a generalizable approach for designing advanced adaptive multispectral camouflage systems.

Main Methods:

• Integration of coding metamaterials with infrared (IR) electrochromic devices.
• Fabrication of metadevices utilizing a chessboard-like configuration of coding metamaterials.
• Employing IR electrochromic devices based on metal reversible electrodeposition on a shared barium fluoride substrate.

Main Results:

• Demonstrated reversible tunability of IR emissivity (0.58 at 3-5 µm, 0.50 at 7.5-13 µm).
• Achieved wideband microwave scattering reduction exceeding 10 dB across the 10-20 GHz range.
• The monolithic design ensured a simple architecture and avoided functional coupling.

Conclusions:

• The developed metadevice successfully integrates adaptive IR emissivity control and microwave scattering reduction.
• The approach offers a promising pathway for creating advanced adaptive multispectral camouflage systems.
• This work provides valuable insights for future developments in intelligent camouflage technologies.