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Optics Express
|February 14, 2023
Summary
Researchers developed a novel fibered optical probe for precise nanoparticle manipulation. This contactless system enables stable trapping and controlled rotation of nanoparticles in challenging environments.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Microfluidics
Background:
- Traditional optical trapping systems are often bulky and limited in harsh environments.
- Contactless manipulation of nanoparticles (NPs) requires advanced optical tweezer designs.
Purpose of the Study:
- To propose a simple fibered optical probe for contactless manipulation of dielectric NPs.
- To enable both trapping and controlled mechanical rotation of NPs using light's angular momentum.
Main Methods:
- Designed a tapered metal-coated optical fiber with a coaxial nano-aperture at its apex.
- Engineered the nano-aperture to break cylindrical symmetry, inducing polarization conversion.
- Utilized numerical simulations to validate the design's optical properties and trapping capabilities.
Main Results:
- The fibered probe design facilitates efficient light transmission and polarization conversion.
- Achieved stable, non-contact trapping of quasi-spherical NPs.
- Demonstrated tunable and reversible NP rotation frequencies (up to 45 Hz in water, 5.3 MHz in air at 10 mW).
Conclusions:
- The proposed fibered optical probe offers a simple yet effective solution for NP manipulation.
- This technology paves the way for miniaturized tools for trapping, sorting, and spinning NPs.
- Enables advanced control of nanoparticles in diverse and demanding applications.
