Visible-infrared compatible stealth metamaterial for space applications

Area of Science:

• Materials Science
• Optics
• Aerospace Engineering

Background:

• Space-to-ground visible and infrared stealth is critical for space technology.
• Existing stealth materials often struggle with broad spectral compatibility.

Purpose of the Study:

• To propose and demonstrate a visible-infrared compatible stealth metamaterial for space applications.
• To achieve high absorptivity in visible and near-infrared spectra while managing thermal radiation in infrared bands.

Main Methods:

• Numerical simulation and experimental fabrication of a metamaterial.
• The metamaterial consists of a multilayer of Germanium (Ge) and Molybdenum (Mo) with Ge nano-pyramids.
• Characterization of optical properties across visible and infrared spectra.

Main Results:

• High absorptivity in visible and near-infrared light.
• Low infrared absorptivity and emissivity in the 3-5 μm and 8-12 μm atmospheric windows.
• High absorption and emission in the 5-8 μm non-atmospheric window for effective heat dissipation.

Conclusions:

• The developed metamaterial demonstrates effective dual-band stealth capabilities.
• This technology has the potential to significantly advance stealth applications in space.
• The material's ability to manage thermal radiation is key for space-based systems.