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Terahertz broadband achromatic focusing vortices
Optics Express
|August 13, 2025
Summary
Researchers developed a new metadevice for broadband achromatic focusing vortices in terahertz (THz) frequencies. This innovation enables THz focusing vortices to be detected in the same area, advancing THz communication and information processing.
Area of Science:
- Metamaterials and Optics
- Terahertz Technology
Background:
- Terahertz (THz) waves offer unique properties for imaging and communication.
- Achieving broadband achromatic focusing vortices has been a significant challenge in THz optics.
Purpose of the Study:
- To design and demonstrate a metadevice capable of generating broadband achromatic focusing vortices in the terahertz frequency range.
- To optimize the metadevice phase profile for achromatic focusing characteristics.
Main Methods:
- Combining achromatic lens phase and spiral phase in a metadevice.
- Utilizing elliptical high-resistivity silicon pillars to achieve a wide propagation phase range.
- Employing the particle swarm optimization (PSO) algorithm to select optimal metaatoms.
Main Results:
- Successfully generated terahertz broadband achromatic focusing vortices from 0.8 THz to 1.3 THz.
- Confirmed broadband achromatic characteristics across the entire design frequency band.
- Demonstrated detection of THz focusing vortices in a consistent area.
Conclusions:
- The proposed metadevice effectively achieves broadband achromatic focusing vortices.
- This design holds significant potential for applications in THz communication systems and information processing.
