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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Active hybrid spintronic THz emitters with tunable chirality.
Optics Express
|November 11, 2025
Summary
This study introduces a novel hybrid terahertz (THz) source combining electrically anisotropic conductors (EACs) and the inverse spin Hall effect (ISHE). The device efficiently generates tunable, circularly polarized THz waves for advanced applications.
Area of Science:
- Terahertz (THz) Science and Technology
- Spintronics
- Materials Science
Background:
- Efficient and flexible terahertz (THz) wave generation is critical for THz sensing, wireless communication, and imaging.
- Electrically anisotropic conductors (EACs) offer THz emission sensitive to crystal orientation, unlike the external magnetic field-dependent inverse spin Hall effect (ISHE) in ferromagnetic metal (FM)/nonmagnetic metal (NM) bilayers.
- A hybrid approach combining EACs and ISHE could lead to more versatile THz sources.
Purpose of the Study:
- To fabricate and characterize a hybrid THz source by integrating EACs (RuO2(101)) with ISHE (Pt/Ni/Pt multilayers).
- To achieve efficient generation of circularly polarized THz waves.
- To demonstrate tunability of THz polarization and waveform.
Main Methods:
- Fabrication of Pt/RuO2(101)/Al2O3(sub)/Ni/Pt multilayer structures.
- Optimization of substrate thickness and incident laser power for THz emission.
- Characterization of THz wave polarization (linear to circular) and ellipticity modulation.
Main Results:
- Efficient generation of circularly polarized THz waves was achieved by optimizing device parameters.
- THz polarization was demonstrated to be tunable from linear to circular by adjusting the azimuth angle.
- The ellipticity and waveform of chiral THz waves could be modulated by incident laser power.
Conclusions:
- The hybrid THz source effectively combines the advantages of EACs and spintronic THz emission.
- The developed device offers tunable polarization and waveform control, meeting diverse THz source demands.
- This work expands the application scope of EACs and spintronic THz emission technologies.
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