Optoelectronic Metasurface for Free-Space Optical-Microwave Interactions

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Photon-electron interactions are crucial for energy conversion, signal processing, and quantum science.
• Existing methods for optical-microwave interactions are limited to fiber and on-chip applications, neglecting free-space wave phenomena.

Purpose of the Study:

• To introduce a novel optoelectronic metasurface for direct, efficient optical-microwave interactions in free space.
• To demonstrate a bias-free, ultrathin metasurface capable of controlling microwave phase with laser intensity.

Main Methods:

• Hybrid integration of microwave resonant meta-structures with photoresponsive materials (photodiodes).
• Theoretical modeling using light-driven electronic excitation and microwave network theory.
• Experimental verification of laser-controlled microwave phase modulation.

Main Results:

• Successful construction of an ultrathin, bias-free optoelectronic metasurface.
• Demonstration of strong laser-microwave coupling, where microwave phase is dependent on laser intensity.
• Experimental observation of decreasing reflected microwave phase with increasing incident laser power.

Conclusions:

• The developed optoelectronic metasurface offers a new strategy for controlling vector fields via optical power intensity in free space.
• This work provides fundamental insights into metasurface capabilities and hybrid wave-matter interactions.
• The findings open new avenues for applications in optical-microwave signal processing and quantum technologies.