Uniform intensity chiral optical field by multifocal synthesis.

Area of Science:

• Optics and Photonics
• Quantum Information Science

Background:

• Chiral optical beams carrying orbital angular momentum (OAM) are vital for applications like optical tweezers and communications.
• Inhomogeneous intensity distributions in conventional chiral beams limit their practical use.

Purpose of the Study:

• To propose novel chiral optical fields with uniform intensity and arbitrary length.
• To overcome limitations posed by inhomogeneous intensity distributions in existing chiral optical beams.

Main Methods:

• Amplitude encoding method and multifocal synthesis were employed to generate the chiral optical fields.
• The distance between focal points was used to control intensity distribution and modulation length.
• Selective retention of focal points allowed for arbitrary field interception.

Main Results:

• Two types of chiral optical fields with uniform intensity and arbitrary length were successfully proposed.
• The proposed method enables independent tunability of topological charges and OAM space-division multiplexing.
• Composite multi-petal vortex arrays demonstrated enhanced information capacity for optical communications.

Conclusions:

• The developed chiral optical fields offer uniform intensity and extended modulation length, broadening their applicability.
• The ability to partition fields and assign topological charges facilitates advanced optical communication and particle manipulation.
• This work presents a significant advancement in generating and controlling complex chiral optical fields.