Compact, low-cost, and low-crosstalk orbital angular momentum sorter based on binary grating

Shuiqin Zheng; Redha H. Al Ibrahim; Omar Alkhazragi; Tien Khee Ng; Boon S. Ooi

doi:10.1016/j.optlastec.2023.109744

Compact, low-cost, and low-crosstalk orbital angular momentum sorter based on binary grating

Shuiqin Zheng, Redha H. Al Ibrahim, Omar Alkhazragi, Tien Khee Ng, Boon S. Ooi

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

4 Scopus citations

Abstract

This paper demonstrates the design, fabrication, and testing of a compact, low-cost, low-crosstalk orbital angular momentum (OAM) sorter. The sorter is based on optical geometric transformation (OGT). This sorter can realize the separation of the OAM states as the traditional sorter, but uses a compact design that utilizes only two phase modulations to realize the transformation and focus. The phase modulations are introduced by distorting the binary gratings by curving the geometrical structure rather than optical path difference. The fabrication is simple and only needs single-step lithography and single-step dry etching on a fused quartz plate. The etching depth error does not affect the sorting result but only the diffraction efficiency. In the experiment, the two binary gratings are fabricated on the same substrate to lower the degrees of freedom of alignment and ensure uniform etching depth. The sorter is further improved by incorporating fan-out diffraction, resulting in a higher separation and lower cross-talk. This sorter can provide a compact, low-cost, low-crosstalk device to realize OAM demultiplexing.

Original language	English (US)
Pages (from-to)	109744
Journal	Optics and Laser Technology
Volume	167
DOIs	https://doi.org/10.1016/j.optlastec.2023.109744
State	Published - Jun 28 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-07-17
Acknowledged KAUST grant number(s): BAS/1/1614-01-01, OSR-CRG2017-3417
Acknowledgements: This work was supported by Guangdong Basic and Applied Basic Research Foundation (2022A1515110496), King Abdullah University of Science and Technology (BAS/1/1614-01-01, OSR-CRG2017-3417), Natural Science Foundation of Guangdong Province (2023A1515011441, 2022A1515140118), and the Great Bay University Scientific Research Start-up Funding (No. YJKY220005). S. Zheng thanks Qingdao municipal bureau of human resources and social security for the support in recovering of unpaid wages.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1016/j.optlastec.2023.109744

Cite this

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title = "Compact, low-cost, and low-crosstalk orbital angular momentum sorter based on binary grating",

abstract = "This paper demonstrates the design, fabrication, and testing of a compact, low-cost, low-crosstalk orbital angular momentum (OAM) sorter. The sorter is based on optical geometric transformation (OGT). This sorter can realize the separation of the OAM states as the traditional sorter, but uses a compact design that utilizes only two phase modulations to realize the transformation and focus. The phase modulations are introduced by distorting the binary gratings by curving the geometrical structure rather than optical path difference. The fabrication is simple and only needs single-step lithography and single-step dry etching on a fused quartz plate. The etching depth error does not affect the sorting result but only the diffraction efficiency. In the experiment, the two binary gratings are fabricated on the same substrate to lower the degrees of freedom of alignment and ensure uniform etching depth. The sorter is further improved by incorporating fan-out diffraction, resulting in a higher separation and lower cross-talk. This sorter can provide a compact, low-cost, low-crosstalk device to realize OAM demultiplexing.",

author = "Shuiqin Zheng and {Al Ibrahim}, {Redha H.} and Omar Alkhazragi and Ng, {Tien Khee} and Ooi, {Boon S.}",

note = "KAUST Repository Item: Exported on 2023-07-17 Acknowledged KAUST grant number(s): BAS/1/1614-01-01, OSR-CRG2017-3417 Acknowledgements: This work was supported by Guangdong Basic and Applied Basic Research Foundation (2022A1515110496), King Abdullah University of Science and Technology (BAS/1/1614-01-01, OSR-CRG2017-3417), Natural Science Foundation of Guangdong Province (2023A1515011441, 2022A1515140118), and the Great Bay University Scientific Research Start-up Funding (No. YJKY220005). S. Zheng thanks Qingdao municipal bureau of human resources and social security for the support in recovering of unpaid wages.",

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AU - Zheng, Shuiqin

AU - Al Ibrahim, Redha H.

AU - Alkhazragi, Omar

AU - Ng, Tien Khee

AU - Ooi, Boon S.

N1 - KAUST Repository Item: Exported on 2023-07-17 Acknowledged KAUST grant number(s): BAS/1/1614-01-01, OSR-CRG2017-3417 Acknowledgements: This work was supported by Guangdong Basic and Applied Basic Research Foundation (2022A1515110496), King Abdullah University of Science and Technology (BAS/1/1614-01-01, OSR-CRG2017-3417), Natural Science Foundation of Guangdong Province (2023A1515011441, 2022A1515140118), and the Great Bay University Scientific Research Start-up Funding (No. YJKY220005). S. Zheng thanks Qingdao municipal bureau of human resources and social security for the support in recovering of unpaid wages.

PY - 2023/6/28

Y1 - 2023/6/28

N2 - This paper demonstrates the design, fabrication, and testing of a compact, low-cost, low-crosstalk orbital angular momentum (OAM) sorter. The sorter is based on optical geometric transformation (OGT). This sorter can realize the separation of the OAM states as the traditional sorter, but uses a compact design that utilizes only two phase modulations to realize the transformation and focus. The phase modulations are introduced by distorting the binary gratings by curving the geometrical structure rather than optical path difference. The fabrication is simple and only needs single-step lithography and single-step dry etching on a fused quartz plate. The etching depth error does not affect the sorting result but only the diffraction efficiency. In the experiment, the two binary gratings are fabricated on the same substrate to lower the degrees of freedom of alignment and ensure uniform etching depth. The sorter is further improved by incorporating fan-out diffraction, resulting in a higher separation and lower cross-talk. This sorter can provide a compact, low-cost, low-crosstalk device to realize OAM demultiplexing.

AB - This paper demonstrates the design, fabrication, and testing of a compact, low-cost, low-crosstalk orbital angular momentum (OAM) sorter. The sorter is based on optical geometric transformation (OGT). This sorter can realize the separation of the OAM states as the traditional sorter, but uses a compact design that utilizes only two phase modulations to realize the transformation and focus. The phase modulations are introduced by distorting the binary gratings by curving the geometrical structure rather than optical path difference. The fabrication is simple and only needs single-step lithography and single-step dry etching on a fused quartz plate. The etching depth error does not affect the sorting result but only the diffraction efficiency. In the experiment, the two binary gratings are fabricated on the same substrate to lower the degrees of freedom of alignment and ensure uniform etching depth. The sorter is further improved by incorporating fan-out diffraction, resulting in a higher separation and lower cross-talk. This sorter can provide a compact, low-cost, low-crosstalk device to realize OAM demultiplexing.

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UR - https://linkinghub.elsevier.com/retrieve/pii/S0030399223006370

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SP - 109744

JO - Optics and Laser Technology

JF - Optics and Laser Technology

ER -

Compact, low-cost, and low-crosstalk orbital angular momentum sorter based on binary grating

Abstract

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