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Integrated Terahertz Generator-Manipulators Using Epsilon-near-Zero-Hybrid Nonlinear Metasurfaces
Yongchang Lu1,2, Xi Feng1,2, Qingwei Wang1,2
1Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China.
Nano Letters
|September 9, 2021
Summary
This study presents a hybrid nonlinear metasurface that integrates terahertz (THz) wave generation and manipulation into a single device. This breakthrough enhances THz conversion efficiency and enables advanced control over THz wave properties.
Area of Science:
- Optics and Photonics
- Materials Science
- Electrical Engineering
Background:
- Terahertz (THz) technologies require separate devices for wave generation and manipulation.
- Integrating these functions into a single device is crucial for advancing THz applications.
Purpose of the Study:
- To demonstrate a hybrid nonlinear plasmonic metasurface for combined THz generation and manipulation.
- To enhance THz wave conversion efficiency and control polarization and wavefront.
Main Methods:
- Fabrication of a hybrid metasurface using an epsilon-near-zero (ENZ) indium tin oxide (ITO) layer.
- Utilizing plasmonic resonance coupling and engineered nonlinear Pancharatnam-Berry (PB) phases.
Main Results:
- Achieved THz conversion efficiency enhancement exceeding 4 orders of magnitude.
- Demonstrated ability to shape polarization and wavefront of emitted THz beams.
- Operates across a wide frequency band.
Conclusions:
- The hybrid nonlinear metasurface seamlessly integrates THz generation and manipulation.
- This approach paves the way for miniaturized, highly functional integrated THz devices and systems.
