A Multifunctional Reconfigurable Terahertz Metasurface Enabling Spin-Decoupled Logic Operations and Holography

Area of Science:

• Terahertz (THz) photonics
• Metamaterials and Plasmonics
• Optical engineering

Background:

• Metasurfaces offer advanced control over electromagnetic waves.
• Reconfigurable metasurfaces are crucial for dynamic optical functions.
• Terahertz technology demands novel components for logic and imaging.

Purpose of the Study:

• To develop a multifunctional and reconfigurable terahertz metasurface.
• To demonstrate light-intensity-driven reconfiguration and spin-decoupled wavefront manipulation.
• To implement terahertz logic modules and spin-dependent holographic imaging.

Main Methods:

• Hybridization of dual split-ring resonators with photosensitive silicon and metallic elements.
• Integration of structural and Pancharatnam-Berry phase control mechanisms.
• Full-wave electromagnetic simulations for performance verification.

Main Results:

• Achieved spin-decoupled manipulation of circularly polarized terahertz waves.
• Successfully implemented two-input/two-output logic modules (OR-XOR and AND-NAND) with verified truth tables.
• Demonstrated a spin- and intensity-dependent hologram producing four distinct far-field images.
• Exhibited a strong cross-polarization response (>0.7 amplitude) at ≈0.95 THz.

Conclusions:

• The proposed metasurface enables optical, light-intensity-driven reconfiguration.
• The device provides a viable route towards chip-scale, integrated terahertz logic.
• This work paves the way for multifunctional terahertz imaging devices.