Scalable generalized meta-spanners enabling parallel multitasking optical manipulation

Area of Science:

• Photonics and optical engineering
• Nanotechnology and materials science
• Biophysics and biomedical engineering

Background:

• Optical manipulation offers contactless control but struggles with parallel multitasking.
• Subwavelength photonic devices require multi-dimensional light sculpting for high-density, versatile manipulation.

Purpose of the Study:

• To introduce generalized optical meta-spanners (GOMSs) for advanced optical manipulation.
• To overcome limitations of conventional optical vortex manipulation.
• To enable high-density, versatile, and parallel particle manipulation.

Main Methods:

• Development of GOMSs based on metasurfaces.
• Generation of speckle-free, customizable optical vortices.
• Suppression of diffractive losses in optical manipulation.
• Reconfigurable particle dynamics via polarization switching.

Main Results:

• Simultaneous achievement of longitudinally varying manipulation and in-plane spanner arrays.
• Outperformance of conventional donut-shaped orbital flows in manipulation tasks.
• Stable manipulation of single particles and particle ensembles.
• Demonstration of scalable multitasking stability for numerous simultaneous optical spanners.

Conclusions:

• GOMSs represent a significant advancement in metadevices, transitioning from wavefront sculptors to particle manipulators.
• The technology facilitates robust multichannel control and scalable multitasking.
• Potential applications include targeted drug delivery and cell-level biomechanics.