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Does the structure of light influence the speckle size?

It is well known that when a laser is reflected from a rough surface or transmitted through a diffusive medium, a speckle pattern will be formed at a given observation plane. An important parameter of speckle is its size, which for the case of homogeneous illumination, well-known relations for its c...

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Autores principales: Hu, Xiao-Bo, Dong, Meng-Xuan, Zhu, Zhi-Han, Gao, Wei, Rosales-Guzmán, Carmelo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6957527/
https://www.ncbi.nlm.nih.gov/pubmed/31932711
http://dx.doi.org/10.1038/s41598-019-56964-0
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author Hu, Xiao-Bo
Dong, Meng-Xuan
Zhu, Zhi-Han
Gao, Wei
Rosales-Guzmán, Carmelo
author_facet Hu, Xiao-Bo
Dong, Meng-Xuan
Zhu, Zhi-Han
Gao, Wei
Rosales-Guzmán, Carmelo
author_sort Hu, Xiao-Bo
collection PubMed
description It is well known that when a laser is reflected from a rough surface or transmitted through a diffusive medium, a speckle pattern will be formed at a given observation plane. An important parameter of speckle is its size, which for the case of homogeneous illumination, well-known relations for its computation have been derived. This is not the case for structured light beams of non-homogeneous intensity and phase distribution. Here, we propose and demonstrate, using Hermite- and Laguerre-Gaussian light modes, that the mean size of the speckle generated by these structured light beams can be measured assuming a homogeneous illumination. We further provide with mathematical expressions that relate the speckle size to the generalised definition of "spot size". To reinforce our assessment, we compare the mean speckle size generated by structured light modes with that generated by wave fronts of constant phase and amplitude and show that in both cases the mean speckle size is almost identical. Our findings reveal a fundamental property of speckle, which will be of great relevance in many speckle-based applications and will pave the way towards the development of novel applications.
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spelling pubmed-69575272020-01-16 Does the structure of light influence the speckle size? Hu, Xiao-Bo Dong, Meng-Xuan Zhu, Zhi-Han Gao, Wei Rosales-Guzmán, Carmelo Sci Rep Article It is well known that when a laser is reflected from a rough surface or transmitted through a diffusive medium, a speckle pattern will be formed at a given observation plane. An important parameter of speckle is its size, which for the case of homogeneous illumination, well-known relations for its computation have been derived. This is not the case for structured light beams of non-homogeneous intensity and phase distribution. Here, we propose and demonstrate, using Hermite- and Laguerre-Gaussian light modes, that the mean size of the speckle generated by these structured light beams can be measured assuming a homogeneous illumination. We further provide with mathematical expressions that relate the speckle size to the generalised definition of "spot size". To reinforce our assessment, we compare the mean speckle size generated by structured light modes with that generated by wave fronts of constant phase and amplitude and show that in both cases the mean speckle size is almost identical. Our findings reveal a fundamental property of speckle, which will be of great relevance in many speckle-based applications and will pave the way towards the development of novel applications. Nature Publishing Group UK 2020-01-13 /pmc/articles/PMC6957527/ /pubmed/31932711 http://dx.doi.org/10.1038/s41598-019-56964-0 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Hu, Xiao-Bo
Dong, Meng-Xuan
Zhu, Zhi-Han
Gao, Wei
Rosales-Guzmán, Carmelo
Does the structure of light influence the speckle size?
title Does the structure of light influence the speckle size?
title_full Does the structure of light influence the speckle size?
title_fullStr Does the structure of light influence the speckle size?
title_full_unstemmed Does the structure of light influence the speckle size?
title_short Does the structure of light influence the speckle size?
title_sort does the structure of light influence the speckle size?
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6957527/
https://www.ncbi.nlm.nih.gov/pubmed/31932711
http://dx.doi.org/10.1038/s41598-019-56964-0
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