Related Experiment Video
Updated: May 19, 2026
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Angularly robust terahertz third-harmonic generation empowered by all-dielectric nonlocal metasurfaces
Zhehao Ye1, Yuancheng Fan1, Xu Ji1
1MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China. phyfan@nwpu.edu.cn.
Nanoscale
|May 18, 2026
Summary
Researchers developed a novel all-dielectric metasurface for robust terahertz third-harmonic generation. This design achieves ultrahigh-Q resonances over a wide angular range, enhancing light-matter interactions for nonlinear applications.
Area of Science:
- Photonics and Metamaterials
- Nonlinear Optics
- Terahertz Science
Background:
- All-dielectric metasurfaces enable enhanced light-matter interactions via high-quality-factor resonances, especially bound states in the continuum (BICs).
- Conventional BICs are limited to narrow frequency and angular ranges due to fixed resonances.
Purpose of the Study:
- To propose a fabrication-friendly all-dielectric nonlocal metasurface for enhanced terahertz third-harmonic generation.
- To achieve robust ultrahigh-Q resonances over a wide incident angle.
Main Methods:
- Utilized Brillouin zone folding to manipulate quasi-guided modes and BICs.
- Investigated physical origins, far-field characteristics, and symmetry-breaking-governed mode switching.
- Fabricated and characterized the all-dielectric nonlocal metasurface.
Main Results:
- Demonstrated robust ultrahigh-Q resonances over a wide incident angle (up to 30°).
- Achieved a high third-harmonic generation conversion efficiency exceeding 10-4.
- Elucidated the mechanism of robust resonance and mode switching.
Conclusions:
- The proposed metasurface offers a viable strategy for robust harmonic generation in the terahertz range.
- Establishes a paradigm for designing high-Q devices for sensing, detection, and nonlinear applications.
