AI Article Synopsis
- The text discusses how small objects can be made to rotate using light under certain conditions, specifically highlighting the importance of absorption or symmetry breaking in the scatterer.
- Nonabsorbing spherical particles are typically unable to rotate due to the conservation of angular momentum, but the authors propose a new method to overcome this limitation through nonlinear light scattering.
- This mechanism involves the excitation of resonant states that can produce a negative optical torque, which could be tested using specific resonant dielectric nanostructures.
Article Abstract
Optically induced mechanical torque driving rotation of small objects requires the presence of absorption or breaking cylindrical symmetry of a scatterer. A spherical nonabsorbing particle cannot rotate due to the conservation of the angular momentum of light upon scattering. Here, we suggest a novel physical mechanism for the angular momentum transfer to nonabsorbing particles via nonlinear light scattering. The breaking of symmetry occurs at the microscopic level manifested in nonlinear negative optical torque due to the excitation of resonant states at the harmonic frequency with higher projection of angular momentum. The proposed physical mechanism can be verified with resonant dielectric nanostructures, and we suggest some specific realizations.
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| http://dx.doi.org/10.1103/PhysRevLett.130.243802 | DOI Listing |
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