Longitudinally tuned OAM vortex beams for advanced particle manipulation
Abstract
Structured light has become a pivotal tool for optical manipulation, advancing applications from biology to micro-engineering. However, conventional orbital angular momentum (OAM) vortex beams are limited to unidirectional particle rotation in transverse planes, leaving longitudinal control largely undeveloped. Here, we introduce a longitudinally tunable OAM vortex beam (LTOVB) that enables versatile particle dynamics along the optical axis—including stationary trapping, speed modulation, and bidirectional rotation—while maintaining a constant orbital radius. Using vector diffraction modeling and experimental validation, we demonstrate programmable particle manipulation across sequentially tuned OAM segments under tight focusing.
Fields of Study & Subjects
Orbital Angular Momentum in Optics
Advanced Electron Microscopy Techniques and Applications
Microfluidic and Bio-sensing Technologies
Publication details
- Journal / source
- Optica
- Publisher
- Optica Publishing Group
- Volume
- 13
- Issue
- 4
- Pages
- 651–651
- Publication date
- 4 March 2026
- Language
- EN