Microwave Metamaterial Absorbers with Controllable Luminescence Features

Area of Science:

• Materials Science
• Metamaterials
• Optoelectronics

Background:

• Traditional microwave absorbers fail to conceal objects from optical detection, especially against variable backgrounds.
• A comprehensive stealth solution is needed to address both microwave and optical signatures simultaneously.
• Metamaterials offer unique electromagnetic properties for advanced applications.

Purpose of the Study:

• To propose an ultrathin, flexible metamaterial for simultaneous wideband microwave absorption and controllable luminescence.
• To develop a multifunctional stealthing technique adaptable to variable environments.
• To explore applications in advanced camouflage and detection evasion.

Main Methods:

• Design and fabrication of an ultrathin flexible metamaterial.
• Characterization of microwave absorption performance across X-band frequencies.
• Integration of an electrical system for real-time control of visible and near-infrared luminescence spectra.

Main Results:

• Achieved >80% microwave energy absorption in the X-band (8-12 GHz) with low polarization sensitivity.
• Demonstrated wide incidence angle stability up to 54°.
• Showcased electrically tunable visible and near-infrared luminescence spectra.

Conclusions:

• The proposed metamaterial offers a novel solution for comprehensive stealth by combining microwave absorption and optical signature control.
• This technology has potential for broader wave band applications and multifunctional stealthing.
• The adaptable nature of the metamaterial makes it suitable for diverse environmental conditions.