Non-linear bistability in pulsed optical traps
Alex J. Vernon, Francisco J. Rodríguez-Fotuño, Anatoly V. Zayats
TL;DR
This paper explores how pulsed optical traps can create bistable effects due to non-linear material responses, impacting nanoparticle manipulation.
Contribution
The study introduces a new formalism for modeling optical forces in pulsed traps that accounts for hysteresis and historical particle trajectories.
Findings
Optical bistability in pulsed traps depends on the particle's historical trajectory.
Existing models fail to capture hysteresis effects due to permittivity feedback.
The formalism can aid in designing optical traps for advanced applications like time crystals.
Abstract
Optical trapping, also known as optical tweezing or optical levitation, is a technique that uses highly focused laser beams to manipulate micro- and nanoscopic particles. In optical traps driven by high-energy pulses, material non-linearity can result in unusual opto-mechanical effects, such as displaced equilibrium points. However, existing theoretical models of non-linear optical force on small particles consider smooth material dependence on the incident field strength alone, and not the feedback between the particle permittivity and internal field strength, which is, in turn, a function of the permittivity. The hysteresis effects of optical bistability in pulsed optical traps, therefore, elude existing optical force models. Here, we investigate a bistable optical trap, set up by counter-propagating ultrashort pulses, in which the optical force exerted on a particle depends not only…
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Taxonomy
TopicsOrbital Angular Momentum in Optics · Cold Atom Physics and Bose-Einstein Condensates · Quantum Information and Cryptography