Power-tunable rotational dynamics of asymmetric vortex dipoles for material characterization

Area of Science:

• Optics and Photonics
• Nonlinear Optics
• Vortex Beam Dynamics

Background:

• Vortex beams carry orbital angular momentum (OAM), influencing light-matter interactions.
• Asymmetric configurations of vortex beams can lead to unique propagation dynamics.

Purpose of the Study:

• Investigate the orbital angular momentum (OAM) and propagation dynamics of asymmetric vortex dipoles.
• Explore the influence of asymmetry and optical power on rotational motion.
• Propose a method for quantifying nonlinear material responses.

Main Methods:

• Theoretical analysis of asymmetric vortex dipole propagation.
• Numerical simulations of linear and nonlinear propagation scenarios.
• Experimental proposal for material nonlocal response measurement.

Main Results:

• Asymmetric vortex dipoles exhibit net OAM and rotational motion.
• Linear propagation shows angular velocity dependence on asymmetry, limited by diffraction.
• Nonlinear propagation dynamics are controllable by optical power, affecting trajectory and velocity.

Conclusions:

• Asymmetric vortex dipoles offer a tunable platform for optical field manipulation.
• The study provides a method to experimentally measure the nonlocal response of nonlinear materials.
• Understanding these dynamics is crucial for advanced optical applications.