Hollow chain-like beams

TL;DR

This paper investigates the generation of hollow chain-like beams through the diffraction of first order Bessel beams by zone plates, analyzing how zone parameters affect the beam's structure and confirming orbital angular momentum experimentally.

Contribution

It introduces a method to generate hollow chain-like beams using zone plates with specific open Fresnel zones and demonstrates experimental validation of the beam's properties.

Findings

Hollow chain-like beams can be generated via diffraction of Bessel beams by zone plates.

The capsule size depends on the second open Fresnel zone and focal length.

Orbital angular momentum is present in the generated beams.

Abstract

To generate hollow chain-like beams the diffraction of the first order Bessel beam by zone plate with two odd open Fresnel zone has been investigated. It has been shown that the capsules size is influenced by the number of the second odd open Fresnel zone and by the zone plate focal length. A hollow chain-like beam has been experimentally generated as a result of the first order Bessel beam diffraction by zone plate with the first and the ninth open Fresnel zones. The orbital angular momentum presence has been proved experimentally. The main features of the beam have been investigated. Sufficiently good agreement between experimental and numerically calculated results has been demonstrated.