Experimental observation and manipulation of optical tornado waves

Area of Science:

• Optics and Photonics
• Wave Propagation
• Nonlinear Optics

Background:

• Optical vortex beams exhibit unique propagation characteristics.
• Tornado waves (ToWs) are a specific type of optical vortex with complex intensity structures.
• Understanding and controlling ToWs is crucial for applications in optical manipulation and information transfer.

Purpose of the Study:

• To experimentally realize and manipulate optical tornado waves (ToWs).
• To investigate the influence of parameters like self-focusing length, total angular momentum, and foci deviation on ToW propagation.
• To demonstrate control over the accumulated rotation angle and angular velocity of ToWs.

Main Methods:

• Experimental generation and manipulation of optical tornado waves.
• Systematic variation of self-focusing length, total angular momentum, and foci deviation.
• Measurement of accumulated rotation angle and comparison with numerical simulations.

Main Results:

• Successful experimental realization and manipulation of optical tornado waves.
• Demonstrated control over the accumulated rotation angle of ToWs from 0° to 1100°.
• Observed that angular velocity is highest near foci overlap, consistent with numerical predictions.

Conclusions:

• Optical tornado waves can be experimentally controlled by adjusting key parameters.
• The propagation dynamics, including angular velocity, are sensitive to initial conditions.
• Experimental findings align well with theoretical and numerical models, validating the understanding of ToW behavior.