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Optical gradient force on chiral particles
Junsuke Yamanishi1, Hyo-Yong Ahn1,2, Hidemasa Yamane3,4
1Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan.
Science Advances
|September 21, 2022
Summary
Circularly polarized light induces a chiral optical force on nanoparticles, dependent on light handedness and particle chirality. This finding offers new methods for chirality sensing and manipulation.
Area of Science:
- Optics
- Nanotechnology
- Physical Chemistry
Background:
- Chiral nanoparticles interact with light in unique ways.
- Optical trapping commonly uses gradient forces, typically dependent on refractive index.
Purpose of the Study:
- Investigate the circular polarization (CP)-dependent gradient force on 3D chiral nanoparticles.
- Understand the factors influencing this force, contrasting it with conventional gradient forces.
Main Methods:
- Optical trapping of chiral nanoparticles using circularly polarized laser beams.
- Experimental measurement and theoretical analysis of the induced gradient force.
Main Results:
- The gradient force on chiral nanoparticles is dependent on the handedness of circularly polarized light and the particle's chirality.
- Spectral features of the force are influenced by the real refractive index and electromagnetic field perturbations due to chiral resonance.
Conclusions:
- The chiral optical force exhibits unique spectral characteristics beyond simple refractive index dependence.
- This research opens avenues for advanced chirality sensing, manipulation, and enantioselective processes.
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