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Polarization-multiplexing terahertz metasurface zone plate for implementing arbitrary spatial coordinate focusing.
Optics Express
|August 13, 2025
Summary
Researchers simplified metasurface design for controlling light polarization. This new method integrates a Fresnel zone plate with a metasurface, enabling complex functionalities like polarization multiplexing with reduced design time and complexity.
Area of Science:
- Optics and Photonics
- Metamaterials Science
Background:
- Metasurface design enables light field control via abrupt phase changes.
- Complex functionalities like polarization multiplexing are challenging and time-consuming to design.
Purpose of the Study:
- To simplify the design process for metasurface structures.
- To achieve independent phase modulation of orthogonal linear polarization components.
Main Methods:
- Integration of a Fresnel zone plate with a metasurface.
- Design and experimental validation of three distinct metasurface samples (M1, M2, M3).
- Utilizing terahertz waves for demonstrating functionalities.
Main Results:
- Demonstrated independent phase modulation for orthogonal polarizations.
- Achieved concentric focusing (M1), off-axis dual-focus with polarization multiplexing (M2), and multi-focal focusing (M3).
- Simulation results aligned with experimental findings, confirming arbitrary spatial coordinate focusing with dual channels.
Conclusions:
- The proposed scheme significantly simplifies terahertz metasurface design, reducing complexity and time.
- This approach facilitates the development of miniaturized and multifunctional wavefront control devices.
