A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams

The design and fabrication of a compact diffractive optical element is presented for the sorting of beams carrying orbital angular momentum (OAM) of light. The sorter combines a conformal mapping transformation with an optical fan-out, performing demultiplexing with unprecedented levels of miniaturi...

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Autores principales: Ruffato, Gianluca, Girardi, Marcello, Massari, Michele, Mafakheri, Erfan, Sephton, Bereneice, Capaldo, Pietro, Forbes, Andrew, Romanato, Filippo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035274/
https://www.ncbi.nlm.nih.gov/pubmed/29980751
http://dx.doi.org/10.1038/s41598-018-28447-1
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author Ruffato, Gianluca
Girardi, Marcello
Massari, Michele
Mafakheri, Erfan
Sephton, Bereneice
Capaldo, Pietro
Forbes, Andrew
Romanato, Filippo
author_facet Ruffato, Gianluca
Girardi, Marcello
Massari, Michele
Mafakheri, Erfan
Sephton, Bereneice
Capaldo, Pietro
Forbes, Andrew
Romanato, Filippo
author_sort Ruffato, Gianluca
collection PubMed
description The design and fabrication of a compact diffractive optical element is presented for the sorting of beams carrying orbital angular momentum (OAM) of light. The sorter combines a conformal mapping transformation with an optical fan-out, performing demultiplexing with unprecedented levels of miniaturization and OAM resolution. Moreover, an innovative configuration is proposed which simplifies alignment procedures and further improves the compactness of the optical device. Samples have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography (EBL) over a glass substrate. A soft-lithography process has been optimized for fast and cheap replica production of the EBL masters. Optical tests with OAM beams confirm the designed performance, showing excellent efficiency and low cross-talk, with high fidelity even with multiplexed input beams. This work paves the way for practical OAM multiplexing and demultiplexing devices for use in classical and quantum communication.
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spelling pubmed-60352742018-07-12 A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams Ruffato, Gianluca Girardi, Marcello Massari, Michele Mafakheri, Erfan Sephton, Bereneice Capaldo, Pietro Forbes, Andrew Romanato, Filippo Sci Rep Article The design and fabrication of a compact diffractive optical element is presented for the sorting of beams carrying orbital angular momentum (OAM) of light. The sorter combines a conformal mapping transformation with an optical fan-out, performing demultiplexing with unprecedented levels of miniaturization and OAM resolution. Moreover, an innovative configuration is proposed which simplifies alignment procedures and further improves the compactness of the optical device. Samples have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography (EBL) over a glass substrate. A soft-lithography process has been optimized for fast and cheap replica production of the EBL masters. Optical tests with OAM beams confirm the designed performance, showing excellent efficiency and low cross-talk, with high fidelity even with multiplexed input beams. This work paves the way for practical OAM multiplexing and demultiplexing devices for use in classical and quantum communication. Nature Publishing Group UK 2018-07-06 /pmc/articles/PMC6035274/ /pubmed/29980751 http://dx.doi.org/10.1038/s41598-018-28447-1 Text en © The Author(s) 2018 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
Ruffato, Gianluca
Girardi, Marcello
Massari, Michele
Mafakheri, Erfan
Sephton, Bereneice
Capaldo, Pietro
Forbes, Andrew
Romanato, Filippo
A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title_full A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title_fullStr A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title_full_unstemmed A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title_short A compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
title_sort compact diffractive sorter for high-resolution demultiplexing of orbital angular momentum beams
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6035274/
https://www.ncbi.nlm.nih.gov/pubmed/29980751
http://dx.doi.org/10.1038/s41598-018-28447-1
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