Optically transparent microwave screens based on engineered graphene layers

Area of Science:

• Materials Science
• Electromagnetics
• Nanotechnology

Background:

• Traditional microwave absorbers are often opaque, limiting their application in scenarios requiring optical transparency.
• Graphene's unique electromagnetic properties offer potential for novel absorber designs.

Purpose of the Study:

• To propose and demonstrate a microwave absorber that is fully transparent in the optical spectrum.
• To engineer graphene sheets for effective microwave absorption within a Salisbury screen configuration.

Main Methods:

• Utilizing a Salisbury screen configuration with a lossless spacer.
• Employing two distinct, engineered graphene sheets as conductive layers.
• Validating experimental results with an analytical equivalent circuital model.

Main Results:

• Achieved near-perfect electromagnetic absorption in the microwave X-band.
• Demonstrated optical transparency of the proposed absorber.
• Confirmed findings through analytical modeling.

Conclusions:

• The proposed graphene-based Salisbury screen is an effective optical transparent microwave absorber.
• Engineering graphene sheets allows for tailored electromagnetic absorption.
• This approach overcomes limitations of opaque microwave absorbers and enables new functionalities.