Enhancing the modal purity of orbital angular momentum photons

Isaac Nape; Bereneice Sephton; Yao Wei Huang; Adam Vallés; Cheng-Wei Qiu; Antonio Ambrosio; Federico Capasso; Andrew Forbes

doi:10.1063/5.0005597

Enhancing the modal purity of orbital angular momentum photons

Isaac Nape, Bereneice Sephton, Yao Wei Huang, Adam Vallés, Cheng-Wei Qiu, Antonio Ambrosio, Federico Capasso, Andrew Forbes

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

32 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	070802
Journal	APL Photonics
Volume	5
Issue number	7
DOIs	https://doi.org/10.1063/5.0005597
State	Published - Jul 13 2020
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-14
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2995
Acknowledgements: I.N. and B.S. would like to acknowledge the Department of Science and Technology (South Africa) for funding and A.V. from the Claude Leon Foundation, F.C. is supported by funding from the Air Force Office of Scientific Research (Grant Nos. MURI: FA9550-14-1-0389, FA9550-16-1-0156), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) (Award No. OSR-2016-CRG5-2995). Y.-W.H. and C.-W.Q. are supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP15-2015-03). This work was performed, in part, at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the NSF under Award No. 1541959. CNS is a part of Harvard University.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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10.1063/5.0005597

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title = "Enhancing the modal purity of orbital angular momentum photons",

abstract = "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.",

author = "Isaac Nape and Bereneice Sephton and Huang, {Yao Wei} and Adam Vall{\'e}s and Cheng-Wei Qiu and Antonio Ambrosio and Federico Capasso and Andrew Forbes",

note = "KAUST Repository Item: Exported on 2022-06-14 Acknowledged KAUST grant number(s): OSR-2016-CRG5-2995 Acknowledgements: I.N. and B.S. would like to acknowledge the Department of Science and Technology (South Africa) for funding and A.V. from the Claude Leon Foundation, F.C. is supported by funding from the Air Force Office of Scientific Research (Grant Nos. MURI: FA9550-14-1-0389, FA9550-16-1-0156), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) (Award No. OSR-2016-CRG5-2995). Y.-W.H. and C.-W.Q. are supported by the National Research Foundation, Prime Minister{\textquoteright}s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP15-2015-03). This work was performed, in part, at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the NSF under Award No. 1541959. CNS is a part of Harvard University. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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doi = "10.1063/5.0005597",

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AU - Nape, Isaac

AU - Sephton, Bereneice

AU - Huang, Yao Wei

AU - Vallés, Adam

AU - Qiu, Cheng-Wei

AU - Ambrosio, Antonio

AU - Capasso, Federico

AU - Forbes, Andrew

N1 - KAUST Repository Item: Exported on 2022-06-14 Acknowledged KAUST grant number(s): OSR-2016-CRG5-2995 Acknowledgements: I.N. and B.S. would like to acknowledge the Department of Science and Technology (South Africa) for funding and A.V. from the Claude Leon Foundation, F.C. is supported by funding from the Air Force Office of Scientific Research (Grant Nos. MURI: FA9550-14-1-0389, FA9550-16-1-0156), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) (Award No. OSR-2016-CRG5-2995). Y.-W.H. and C.-W.Q. are supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP15-2015-03). This work was performed, in part, at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the NSF under Award No. 1541959. CNS is a part of Harvard University. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2020/7/13

Y1 - 2020/7/13

N2 - 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.

AB - 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.

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U2 - 10.1063/5.0005597

DO - 10.1063/5.0005597

M3 - Article

SN - 2378-0967

VL - 5

SP - 070802

JO - APL Photonics

JF - APL Photonics

IS - 7

ER -

Enhancing the modal purity of orbital angular momentum photons

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