Independent and dynamic manipulation of surface waves radiation for quadruplex polarization channels enabled by...

Area of Science:

• Metamaterials and Metasurfaces
• Electromagnetics and Wave Propagation
• Surface Wave Manipulation

Background:

• Metasurfaces offer advanced control over surface waves (SWs) radiation.
• Existing methods are limited by single radiation channels and fixed patterns, hindering intelligent metadevices.
• There is a need for dynamic and multi-channel control of SWs radiation.

Purpose of the Study:

• To propose and demonstrate a novel SWs radiation metadevice for independent and dynamic manipulation of SWs in four polarization channels.
• To overcome the limitations of single-channel and immutable radiation patterns in existing schemes.
• To enable high-integration intelligent metadevices through flexible SWs control.

Main Methods:

• Design of a waveguide port and guided wave structure to excite and propagate SWs.
• Development of a programmable coding metasurface with spin-decoupled meta-atoms.
• Integration of positive-intrinsic-negative (PIN) diodes within meta-atoms for dynamic control of ON/OFF states.
• Conversion of SWs into x-polarized, y-polarized, left-handed circular polarized, and right-handed circular polarized radiation waves.

Main Results:

• The proposed metadevice successfully achieves independent and dynamic manipulation of SWs directional radiation in four distinct polarization channels.
• Simulation and experimental results validate the theoretical predictions and demonstrate the feasibility of the methodology.
• The metadevice exhibits high radiation efficiency and broad radiation bandwidth.

Conclusions:

• The developed four-channel SWs radiation metadevice offers a flexible platform for manipulating SWs radiation.
• This innovative design overcomes previous limitations, paving the way for advanced intelligent metadevices.
• The technology holds significant potential for various engineering applications requiring precise wave control.