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Fully tunable on-chip meta-generator for multidimensional Poincaré sphere mapping
Shuang Zheng1,2,3, Jing Luan4,5, Tiange Wu4,5
1School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China. zshust@hust.edu.cn.
Light, Science & Applications
|August 7, 2026
Summary
Researchers developed a tunable on-chip meta-generator for structured light. This photonic chip enables flexible control of light
Area of Science:
- Photonics and Optical Engineering
- Quantum Information Science
Background:
- Structured light beams, described by Poincaré spheres, are crucial for optical communications and quantum information.
- Current methods for generating these beams use bulky free-space optics, limiting scalability and integration.
- A fully tunable, chip-based solution for dynamic control of structured light has been a significant challenge.
Purpose of the Study:
- To present the first fully tunable on-chip meta-generator for structured light.
- To enable dynamic mapping of arbitrary light states across multiple Poincaré spheres.
- To overcome limitations of free-space optics for structured light generation and control.
Main Methods:
- Implementation on an eight-channel space-multiplexed silicon photonic integrated circuit.
- Integration of mode multiplexers, amplitude-phase modulators, and an inverse-designed multimode meta-waveguide.
- Utilizing the meta-waveguide to map guided modes to orbital angular momentum (OAM) with high purity.
Main Results:
- Demonstration of a fully tunable on-chip meta-generator for arbitrary scalar, vectorial, and hybrid light modes.
- Broadband generation of high-purity OAM modes with diverse polarization states and topological charges.
- Achieved full-field control over OAM mode bases, enabling access to multiple Poincaré spheres.
Conclusions:
- This work represents a significant advancement in on-chip manipulation of multidimensional Poincaré spheres.
- The developed meta-generator offers compact, precise, and programmable control of structured light.
- Paves the way for advanced applications in optical communications, quantum photonics, and integrated photonic systems.
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