Enhancing the modal purity of orbital angular momentum photons
Orbital angular momentum (OAM) beams with topological charge ℓ are commonly generated and detected by modulating an incoming field with an azimuthal phase profile of the form exp(iℓϕ) by a variety of approaches. This results in unwanted radial modes and reduced power in the desired OAM mode. Here, w...
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doaj-fedeedf8e147445cb968397e0ae4a6c32020-11-25T03:18:25ZengAIP Publishing LLCAPL Photonics2378-09672020-07-0157070802070802-910.1063/5.0005597Enhancing the modal purity of orbital angular momentum photonsIsaac Nape0Bereneice Sephton1Yao-Wei Huang2Adam Vallés3Cheng-Wei Qiu4Antonio Ambrosio5Federico Capasso6Andrew Forbes7School of Physics, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South AfricaSchool of Physics, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South AfricaHarvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USASchool of Physics, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South AfricaDepartment of Electrical and Computer Engineering, National University of Singapore, 117583, SingaporeCNST - Fondazione Istituto Italiano di Tecnologia, Via Giovanni Pascoli, 70, 20133 Milano MI, ItalyHarvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USASchool of Physics, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South AfricaOrbital angular momentum (OAM) beams with topological charge ℓ are commonly generated and detected by modulating an incoming field with an azimuthal phase profile of the form exp(iℓϕ) by a variety of approaches. This results in unwanted radial modes and reduced power in the desired OAM mode. Here, we show how to enhance the modal purity in the creation and detection of classical OAM beams and in the quantum detection of OAM photons. Classically, we combine holographic and metasurface control to produce high purity OAM modes and show how to detect them with high efficiency, extending the demonstration to the quantum realm with spatial light modulators. We demonstrate ultra-high purity OAM modes in orders as high as ℓ = 100 and a doubling of dimensionality in the quantum OAM spectrum from a spontaneous parametric downconversion source. Our work offers a simple route to increase the channel capacity in classical and quantum communication using OAM modes as a basis.http://dx.doi.org/10.1063/5.0005597 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Isaac Nape Bereneice Sephton Yao-Wei Huang Adam Vallés Cheng-Wei Qiu Antonio Ambrosio Federico Capasso Andrew Forbes |
spellingShingle |
Isaac Nape Bereneice Sephton Yao-Wei Huang Adam Vallés Cheng-Wei Qiu Antonio Ambrosio Federico Capasso Andrew Forbes Enhancing the modal purity of orbital angular momentum photons APL Photonics |
author_facet |
Isaac Nape Bereneice Sephton Yao-Wei Huang Adam Vallés Cheng-Wei Qiu Antonio Ambrosio Federico Capasso Andrew Forbes |
author_sort |
Isaac Nape |
title |
Enhancing the modal purity of orbital angular momentum photons |
title_short |
Enhancing the modal purity of orbital angular momentum photons |
title_full |
Enhancing the modal purity of orbital angular momentum photons |
title_fullStr |
Enhancing the modal purity of orbital angular momentum photons |
title_full_unstemmed |
Enhancing the modal purity of orbital angular momentum photons |
title_sort |
enhancing the modal purity of orbital angular momentum photons |
publisher |
AIP Publishing LLC |
series |
APL Photonics |
issn |
2378-0967 |
publishDate |
2020-07-01 |
description |
Orbital angular momentum (OAM) beams with topological charge ℓ are commonly generated and detected by modulating an incoming field with an azimuthal phase profile of the form exp(iℓϕ) by a variety of approaches. This results in unwanted radial modes and reduced power in the desired OAM mode. Here, we show how to enhance the modal purity in the creation and detection of classical OAM beams and in the quantum detection of OAM photons. Classically, we combine holographic and metasurface control to produce high purity OAM modes and show how to detect them with high efficiency, extending the demonstration to the quantum realm with spatial light modulators. We demonstrate ultra-high purity OAM modes in orders as high as ℓ = 100 and a doubling of dimensionality in the quantum OAM spectrum from a spontaneous parametric downconversion source. Our work offers a simple route to increase the channel capacity in classical and quantum communication using OAM modes as a basis. |
url |
http://dx.doi.org/10.1063/5.0005597 |
work_keys_str_mv |
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