Nonequilibrium dynamics induced by scattering forces for optically trapped nanoparticles in strongly inertial regimes

Abstract

As a first approximation, the forces acting on optically trapped particles are commonly assumed to be conservative. The influence of the nonconservative force has been shown to be negligible in overdamped liquid environments. However, its impact in the underdamped regime remains unexplored. Here, we experimentally study the combined effects of gradient and scattering forces on the nonlinear dynamics of trapped particles at various air pressures, leading to significant low-frequency noise excess along the optical axis and the emergence of toroidal Brownian vortices. Our results supported, by numerical simulations and a theoretical model, provide fundamental insights into the functioning of optical tweezers and a means for investigating nonequilibrium steady states in the presence of nonconservative forces.

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Cited by in corpus (11)

• Mesoscopic physics of nanomechanical systems
• Giant diffusion of nanomechanical rotors in a tilted washboard potential
• Path integrals and nonlinear optical tweezers
• Stochastic Inference of Surface-Induced Effects using Brownian Motion
• The role of non-conservative scattering forces and damping on Brownian particles in optical traps
• Suppressing Frequency Fluctuations of Self-Sustained Vibrations in Underdamped Nonlinear Resonators
• A nano vacuum gauge based on second-order coherence in optical levitation
• Active velocity processes with suprathermal stationary distributions and long-time tails
• Spatial distributions of non-conservatively interacting particles
• Two dimensional Coulomb gas in a non-conservative trap
• Steady state of overdamped particles in the non-conservative force field of a simple non-linear model of optical trap