Superheterodyne-inspired waveguide-integrated metasurfaces for flexible free-space light manipulation

Area of Science:

• Photonics and Nanotechnology
• Integrated Optics
• Metasurface Engineering

Background:

• Metasurfaces offer advanced light manipulation but typically require external excitation, hindering on-chip integration.
• Existing metasurfaces face limitations in full integration within photonic circuits.

Purpose of the Study:

• To propose and demonstrate a waveguide-integrated metasurface architecture inspired by the superheterodyne principle.
• To enable efficient conversion of in-plane guided modes to out-of-plane free-space modes for integrated photonic devices.

Main Methods:

• Development of a theoretical model for the superheterodyne metasurface, verified by simulations and experiments.
• Design of silicon-based metasurfaces utilizing baseband signal principles for light control.
• Implementation of waveguide integration for enhanced functionality.

Main Results:

• Demonstration of a novel metasurface capable of converting guided modes to free-space modes.
• Achieved complex light manipulations, including arbitrary beam deflection and focusing.
• Verified the theoretical model through simulation and experimental validation.

Conclusions:

• The proposed superheterodyne metasurface represents a paradigm shift, merging radio communication principles with photonics.
• This technology empowers integrated photonic devices with enhanced free-space interactivity.
• Enables diverse applications in optical communications, remote sensing, and imaging.