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A compact single channel interferometer to study vortex beam propagation through scattering layers.

Sruthy J Lathika¹, Vijayakumar Anand^1,2, Shanti Bhattacharya³

¹Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.

Scientific Reports

|January 17, 2020

Summary

This summary is machine-generated.

This study presents a novel interferometer for studying vortex beam scattering. The device uses a multifunctional diffractive optical element to isolate and analyze the effects of scatterers on orbital angular momentum-carrying beams.

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Area of Science:

Optics
Quantum Optics
Beam Propagation

Background:

Vortex beams, characterized by orbital angular momentum (OAM), exhibit unique propagation properties.
Understanding how these beams interact with scattering media is crucial for applications in imaging and communication.
Previous studies have yielded conflicting results regarding the scattering behavior of vortex beams with different OAM charges.

Purpose of the Study:

To develop and demonstrate a single-channel interferometer for investigating vortex beam propagation through scattering media.
To provide a simple and compact experimental setup for studying the scattering effects on vortex beams.

Main Methods:

A multifunctional diffractive optical element (MDOE) was synthesized by multiplexing Fresnel and spiral Fresnel zone plates.
The MDOE generated two co-propagating beams: one carrying orbital angular momentum (vortex beam) and a reference beam.
The vortex beam was selectively modulated by an annular stack of thin scatterers, while the reference beam passed unmodulated.
Interference patterns were recorded at the focal plane of the spiral Fresnel zone plate.

Main Results:

The proposed interferometer successfully enabled the study of vortex beam scattering through varying numbers of thin scatterers.
The setup allowed for the isolation of scattering effects on the OAM-carrying beam.

Conclusions:

The developed single-channel interferometer offers a straightforward and compact method for experimental analysis of vortex beam scattering.
This technique can help resolve discrepancies in previous research concerning the scattering of vortex beams with different OAM charges.