Multifunctional analysis and verification of lightning-type electromagnetic metasurfaces

Area of Science:

• Metasurfaces
• Electromagnetics
• Nanotechnology

Background:

• Existing electromagnetic metasurfaces often exhibit single functionality and limited application scope.
• There is a need for highly integrated metasurfaces capable of performing multiple functions simultaneously.

Purpose of the Study:

• To propose and analyze a novel, highly integrated lightning-type metasurface.
• To demonstrate the multifunctional capabilities of the designed metasurface, including circular dichroism, wave absorption, and polarization conversion.

Main Methods:

• Numerical calculations were employed to analyze the performance of the designed metasurface.
• The metasurface structure comprises a bottom grating, SiO2 layers, graphene, and photosensitive silicon.

Main Results:

• Achieved over 85% circular dichroism (CD) at 4.22 THz.
• Demonstrated bimodal electromagnetic wave absorption at 4.09 and 8.69 THz.
• Obtained >99% polarization conversion ratio (PCR) for cross-polarization conversion (CPC) from 7.41 to 8.21 THz, and achieved linear-to-circular polarization conversion (LTC-PC) at 50% PCR.
• Exhibited asymmetric transmission (AT) of nearly 60% at 7.84 THz.

Conclusions:

• The proposed lightning-type metasurface successfully integrates multiple electromagnetic functions.
• This design offers a new approach for developing advanced optical and electronic devices for applications in biomedical detection, image processing, and smart switches.