Generation of polygonal non-diffracting beams via angular spectral phases

Area of Science:

• Optics and Photonics
• Structured Light
• Beam Shaping

Background:

• Non-diffracting beams maintain their intensity profile over long distances.
• Optical caustics and cross-phase techniques offer methods for beam structuring.
• Controlling particle motion with light requires precisely shaped beams.

Purpose of the Study:

• To demonstrate an effective method for generating polygonal non-diffracting beams (PNDBs).
• To investigate the properties and applications of these PNDBs in particle manipulation.

Main Methods:

• Generation of PNDBs using optical caustics and cross-phases.
• Flexible control of beam structure via the exponent factor of cross-phases.
• Experimental validation of beam properties and particle manipulation capabilities.

Main Results:

• Successfully generated PNDBs with polygonal transverse structures and significant intensity/phase gradients.
• Demonstrated excellent non-diffracting properties of the generated beams.
• Achieved stable capture and manipulation of particles along polygonal trajectories, including start/stop control.

Conclusions:

• The demonstrated approach effectively generates diverse PNDBs by controlling cross-phase parameters.
• PNDBs exhibit robust non-diffracting characteristics and precise particle manipulation capabilities.
• These PNDBs hold potential for advanced applications in optical tweezers and micromachining.