Chirality and helicity of linearly-polarised Laguerre-Gaussian beams of small beam waists

Mohamed Babiker; Koray Koksal; V. E. Lembessis; Jun Yuan

doi:10.1016/j.optcom.2021.126907

Chirality and helicity of linearly-polarised Laguerre-Gaussian beams of small beam waists

Mohamed Babiker, Koray Koksal, V. E. Lembessis, Jun Yuan

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The chirality and helicity of a linearly polarised Laguerre-Gaussian (LG) beam are examined. Such a type of light possesses a large longitudinal field amplitude when it is created with a sufficiently small beam waist and so gives rise to substantial magnitudes of chirality and helicity density distributions. In the simplest case of a doughnut beam of winding number ℓ=1 and another identical to it but for which ℓ=−1, we obtain different chirality and helicity distributions in the focal plane z=0. We also show that this chiral behaviour persists and the patterns evolve so that on planes at z<0 and z>0 the beam convergence phase contributes differently to the changes in the chirality and helicity distributions.

Original language	English
Article number	126907
Journal	Optics Communications
Volume	490
Early online date	8 Mar 2021
DOIs	https://doi.org/10.1016/j.optcom.2021.126907
Publication status	E-pub ahead of print - 8 Mar 2021

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10.1016/j.optcom.2021.126907

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Cite this

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title = "Chirality and helicity of linearly-polarised Laguerre-Gaussian beams of small beam waists",

abstract = "The chirality and helicity of a linearly polarised Laguerre-Gaussian (LG) beam are examined. Such a type of light possesses a large longitudinal field amplitude when it is created with a sufficiently small beam waist and so gives rise to substantial magnitudes of chirality and helicity density distributions. In the simplest case of a doughnut beam of winding number ℓ=1 and another identical to it but for which ℓ=−1, we obtain different chirality and helicity distributions in the focal plane z=0. We also show that this chiral behaviour persists and the patterns evolve so that on planes at z<0 and z>0 the beam convergence phase contributes differently to the changes in the chirality and helicity distributions.",

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AU - Babiker, Mohamed

AU - Koksal, Koray

AU - Lembessis, V. E.

AU - Yuan, Jun

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