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Non-collinear interaction of photons with orbital angular momentum
We study the nonlinear interaction between two non-collinear light beams that carry orbital angular momentum (OAM). More specifically, two incident beams interact at an angle in a medium with a second order nonlinearity and thus generate a third, non-collinear beam at the second harmonic frequency t...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3861806/ https://www.ncbi.nlm.nih.gov/pubmed/24336441 http://dx.doi.org/10.1038/srep03491 |
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author | Roger, Thomas Heitz, Julius J. F. Wright, Ewan M. Faccio, Daniele |
author_facet | Roger, Thomas Heitz, Julius J. F. Wright, Ewan M. Faccio, Daniele |
author_sort | Roger, Thomas |
collection | PubMed |
description | We study the nonlinear interaction between two non-collinear light beams that carry orbital angular momentum (OAM). More specifically, two incident beams interact at an angle in a medium with a second order nonlinearity and thus generate a third, non-collinear beam at the second harmonic frequency that experiences a reduced conversion efficiency in comparison to that expected based on conventional phase-matching theory. This reduction scales with the input beam OAM and, differently from previous spiral bandwidth calculations, is due to a geometric effect whereby the input OAM is projected along the non-collinear interaction direction. The effect is relevant even at small interaction angles and is further complicated at large angles by a non-conservation of the total OAM in the nonlinear interaction. Experiments are performed under different conditions and are in excellent agreement with the theory. Our results have implications beyond the specific case studied here of second-harmonic generation, in particular for parametric down-conversion of photons or in general for phase-matched non-collinear interactions between beams with different OAM. |
format | Online Article Text |
id | pubmed-3861806 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-38618062013-12-13 Non-collinear interaction of photons with orbital angular momentum Roger, Thomas Heitz, Julius J. F. Wright, Ewan M. Faccio, Daniele Sci Rep Article We study the nonlinear interaction between two non-collinear light beams that carry orbital angular momentum (OAM). More specifically, two incident beams interact at an angle in a medium with a second order nonlinearity and thus generate a third, non-collinear beam at the second harmonic frequency that experiences a reduced conversion efficiency in comparison to that expected based on conventional phase-matching theory. This reduction scales with the input beam OAM and, differently from previous spiral bandwidth calculations, is due to a geometric effect whereby the input OAM is projected along the non-collinear interaction direction. The effect is relevant even at small interaction angles and is further complicated at large angles by a non-conservation of the total OAM in the nonlinear interaction. Experiments are performed under different conditions and are in excellent agreement with the theory. Our results have implications beyond the specific case studied here of second-harmonic generation, in particular for parametric down-conversion of photons or in general for phase-matched non-collinear interactions between beams with different OAM. Nature Publishing Group 2013-12-13 /pmc/articles/PMC3861806/ /pubmed/24336441 http://dx.doi.org/10.1038/srep03491 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Article Roger, Thomas Heitz, Julius J. F. Wright, Ewan M. Faccio, Daniele Non-collinear interaction of photons with orbital angular momentum |
title | Non-collinear interaction of photons with orbital angular momentum |
title_full | Non-collinear interaction of photons with orbital angular momentum |
title_fullStr | Non-collinear interaction of photons with orbital angular momentum |
title_full_unstemmed | Non-collinear interaction of photons with orbital angular momentum |
title_short | Non-collinear interaction of photons with orbital angular momentum |
title_sort | non-collinear interaction of photons with orbital angular momentum |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3861806/ https://www.ncbi.nlm.nih.gov/pubmed/24336441 http://dx.doi.org/10.1038/srep03491 |
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