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Modifying Bessel beam profiles with a spherulite-based radial polarizer.

Amante T Ama, Raphael A Guerrero

|April 1, 2020

Summary

Researchers created a novel radial polarizer from polymer spherulites. This device transforms Bessel beams, creating a central intensity singularity and rotating polarization states.

Area of Science:

Optics and Photonics
Materials Science

Background:

Bessel beams are non-diffracting beams with unique intensity profiles.
Radial polarizers control light polarization in a radial or azimuthal manner.
Controlling beam characteristics is crucial for advanced optical applications.

Purpose of the Study:

To fabricate a novel radial polarizer using a thickness-constrained spherulite.
To investigate the effect of this radial polarizer on a zero-order Bessel beam.
To demonstrate the ability to alter and rotate the beam's intensity profile.

Main Methods:

A thickness-constrained spherulite was grown from an oleoresin polymer.
The fabricated radial polarizer was inserted between crossed linear polarizers.
The device's effect on a zero-order Bessel beam's intensity profile was analyzed.

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Beam rotation was achieved by reorienting the crossed polarizers.

Main Results:

The radial polarizer successfully altered the intensity profile of the incident Bessel beam.
The output beam exhibited a pronounced intensity singularity at the center.
Experimental results showed a transformation of the Bessel beam order from l=0 to l=2.
Simple reorientation of the polarizers allowed for beam rotation.

Conclusions:

The developed radial polarizer effectively modifies Bessel beam characteristics.
This device offers a method for creating radially polarized beams with tunable singularities.
The findings have potential applications in optical manipulation and beam shaping.