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Tunable optical traps over nonreciprocal surfaces
Optics Express
|December 23, 2022
Summary
We developed a new method to create and control optical traps on plasmonic surfaces using nonreciprocity. This technique allows precise manipulation of nanoparticles with low-power lasers, overcoming limitations of traditional optical tweezers.
Area of Science:
- Nanotechnology
- Optics
- Materials Science
Background:
- Conventional optical tweezers face challenges in manipulating nanoscale objects.
- Controlling optical traps with external bias requires advanced surface engineering.
Purpose of the Study:
- To engineer stable optical traps over plasmonic surfaces.
- To precisely control nanoparticle manipulation using external bias and induced nonreciprocity.
Main Methods:
- Utilizing an incident Gaussian beam to polarize nanoparticles.
- Exploiting nonreciprocal and spin-orbit lateral recoil forces.
- Developing a theoretical framework based on Lorentz force and nonreciprocal Green's functions.
Main Results:
- Demonstrated stable optical trap formation and position control.
- Calculated trapping potential using the developed theoretical framework.
- Explored graphene-based metasurfaces for mid-IR optical trapping.
Conclusions:
- Nonreciprocal metasurfaces offer novel capabilities for trapping and assembling nanoparticles.
- This approach overcomes limitations of conventional optical tweezers for nanoscale manipulation.
- Continuous trap manipulation is achievable with a longitudinal drift bias.
