Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes

Area of Science:

• Metamaterials and Nanophotonics
• Electromagnetics and Wave Manipulation

Background:

• Active metasurfaces offer tunable electromagnetic wave control but suffer from poor switch isolation and power limitations.
• Dynamically tunable metasurfaces are crucial for advanced applications, driving research into new control mechanisms.

Purpose of the Study:

• To develop and demonstrate a hydrodynamic metasurface (HMS) capable of programmable electromagnetic beam scanning in azimuth and elevation planes.
• To overcome the limitations of existing active metasurfaces, such as poor switch isolation and complex biasing.

Main Methods:

• Integration of four micropumps controlling metasurface elements via microfluidic channels within the HMS base.
• Regulation of microfluidic flow to induce controlled phase irregularities in incident wave transmission.
• Fabrication of a proof-of-concept HMS and performance evaluation through far-field scanning experiments.

Main Results:

• Successful demonstration of electromagnetic beam scanning using the hydrodynamic metasurface.
• Numerical and experimental results confirm the feasibility and effectiveness of the proposed HMS platform.
• Achieved programmable control over electromagnetic wave propagation through fluidic manipulation.

Conclusions:

• The hydrodynamic metasurface presents a viable and promising alternative to bulky cascading active components for beam scanning applications.
• This work advances metasurface technology, offering a new paradigm for dynamic wave manipulation with high application potential.
• The HMS platform provides a robust and reconfigurable solution for electromagnetic beam steering.