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Switchable optical trapping based on vortex-pair beams generated by a polarization-multiplexed dielectric metasurface
Hongliang Li1,2, Jisen Wen3, Song Gao4
1Department of Electronic Engineering, Kwangwoon University, Seoul, 01897, South Korea. slee@kw.ac.kr.
Nanoscale
|October 16, 2023
Summary
Researchers developed a novel switchable optical trapping method using a metasurface to control microparticles. This technique enables flexible manipulation and simultaneous trapping of multiple particles, advancing optical trapping applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Optical trapping is crucial for microparticle manipulation but faces limitations in multiparticle handling and integration.
- Existing methods struggle with flexible control and simultaneous trapping of multiple microparticles.
Purpose of the Study:
- To propose and demonstrate a switchable optical trapping scheme for microparticles.
- To overcome limitations in multiparticle trapping and flexible manipulation using a novel optical setup.
Main Methods:
- Fabrication and characterization of a miniaturized all-dielectric metasurface composed of titanium dioxide nanoposts.
- Generation of polarization-tuned two-fold vortex-pair beams by the metasurface.
- Demonstration of switchable trapping by adjusting polarization (transverse electric and transverse magnetic) and vortex beam properties.
Main Results:
- The metasurface successfully generated tunable vortex-pair beams with controllable topological charges and phase singularity separations.
- Single microparticle trapping was achieved with opposite topological charge vortex pairs under transverse electric polarization.
- Simultaneous trapping of two microparticles was demonstrated with same topological charge vortex pairs under transverse magnetic polarization.
Conclusions:
- The proposed switchable optical trapping scheme offers enhanced integration and flexible manipulation capabilities for multiple particles.
- This technology holds significant potential for applications in biophysics, nanotechnology, and photonics.
- The polarization-tunable metasurface provides a versatile platform for advanced optical manipulation techniques.
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