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Reconstructing Focal Topological Curves through Vortex Spots from Multifocal Metasurfaces
Hongguang Dong1, Raheel Ahmed Janjua1, Zhipeng Hu1
1National Engineering Research Center for Optical Instruments, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310058, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 30, 2025
Summary
Researchers reconstructed focal topological curves using synthetic multifocal metasurfaces. This technique enables novel high-dimensional manipulation of focal optical fields with metasurfaces.
Area of Science:
- Photonics and optical physics
- Metasurface optics
- Topological photonics
Background:
- Structured light is crucial in modern photonics.
- Metasurfaces offer advanced control over light fields.
- Topological photonics explores exotic light states.
Purpose of the Study:
- To propose and demonstrate two distinct methods for reconstructing focal topological curves.
- To utilize synthetic multifocal metasurfaces for generating vortex spot arrays.
- To investigate the manipulation of focal optical fields.
Main Methods:
- Design and fabrication of multichannel multifocal silicon metasurfaces.
- Generation of vortex spot arrays for spatial topological photonics.
- Direct visualization of near-infrared focal fields using upconverted fluorescence.
Main Results:
- Two approaches successfully reconstructed focal topological curves.
- Focal vortex lattices created closed multi-contoured boundary states.
- Chains of overlapping vortex spots directly formed focal topological curves.
- Curve morphology depended on vortex topological charge.
Conclusions:
- The developed methods enable precise reconstruction of focal topological curves.
- This work advances high-dimensional manipulation capabilities in focal optical fields.
- Metasurface-based optical field control is significantly enhanced.
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