Switchable Multi-Spectral Electromagnetic Defense in the Ultraviolet, Visible, Infrared, Gigahertz, and Terahertz...

Area of Science:

• Materials Science
• Electromagnetics
• Nanotechnology

Background:

• Traditional passive electromagnetic defense materials fail against complex multispectral threats.
• There is a need for adaptive and switchable electromagnetic protection across a wide spectrum.

Purpose of the Study:

• To develop a magnetically controllable soft actuator (MCSA) for intelligent, switchable multispectral electromagnetic defense.
• To integrate advanced materials for enhanced radiation management and stealth applications.

Main Methods:

• Construction of a bilayer heterofilm (BLH film)-based MCSA with distinct defense and drive units.
• Fabrication of a multilayer gradient impedance matching (M-BLH-300) absorber for microwave and terahertz stealth.
• Characterization of electromagnetic properties including infrared emissivity, UV/visible light blocking, and microwave absorption.

Main Results:

• The BLH film achieved exceptionally low infrared emissivity (0.04 at 14 μm) and complete UV/visible light blocking.
• The MCSA demonstrated switchable defense from ultraviolet to terahertz spectra via magnetic actuation.
• The M-BLH-300 absorber exhibited strong microwave absorption (-26.7 dB) and effective bandwidth (4.85 GHz), with retained performance in the terahertz range.

Conclusions:

• The developed MCSA provides intelligent, switchable, and multispectral electromagnetic defense capabilities.
• The innovative design concept paves the way for next-generation advanced electromagnetic defense systems.
• The material's properties are suitable for stealth applications and broad-spectrum protection.