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Broadband transmissive terahertz metasurface for simultaneous quad-mode OAM multiplexing
Optics Express
|June 11, 2026
Summary
This study introduces a novel three-layer metasurface capable of generating four orbital angular momentum (OAM) modes for terahertz (THz) communication. The device demonstrates efficient multi-mode OAM generation and detection, paving the way for high-capacity THz systems.
Area of Science:
- Optics and Photonics
- Metamaterials
- Terahertz Technology
Background:
- Orbital angular momentum (OAM) multiplexing metasurfaces are key for efficient terahertz (THz) communication.
- Existing metasurfaces face challenges in flexibility and efficiency for multi-mode OAM generation.
Purpose of the Study:
- To propose and demonstrate a novel cascaded three-layer polarization-selective transmissive OAM metasurface.
- To achieve simultaneous generation and detection of multiple OAM modes in the THz band.
Main Methods:
- Design of a three-layer metasurface unit cell with polarizers and phase-adjusting resonators.
- Arrangement of unit cells to enable multi-mode OAM generation.
- Full-wave simulations and experimental characterization from 130-210 GHz.
Main Results:
- Simultaneous generation of four OAM modes (+1, -1, +2, -2) at distinct angles.
- Wide frequency performance from 130-230 GHz (simulated) and 130-210 GHz (experimental).
- Experimental validation of OAM mode generation and detection with good simulation agreement.
Conclusions:
- The proposed metasurface effectively generates and detects multiple OAM modes in the THz range.
- The design shows strong potential for advancing high-capacity terahertz communication systems.
