Magnetic field sensing using laser written birefringent scattering medium
Magnetic field sensing using laser written birefringent scattering medium
We demonstrate a polarization analyser based on processing of speckle patterns generated by a scattering medium. Each speckle pattern at a given wavelength and polarization state is unique and deterministic, and thus the polarization angle alters the speckle pattern motif. The polarization state of a given input light is obtained using reconstructive linear algebra methods. The system consists of a femtosecond laser written scattering chip and a CMOS sensor and contains no moving parts, making the proposed solution is low-cost and compact. The linear polarization angle was accurately reconstructed over a 0-20° test range, with 6 arcminutes (1/10° ) standard error. To demonstrate an application as a polarimeter, we used the system to measure Faraday rotation in a SF59 lead silicate glass within an electromagnet. The magnetic field was successfully traced by determining the induced changes in the input beam’s linear polarization angle in the range 0-80 mT with 10 mT standard error.
Faraday rotation, Optical scattering, magnetic field sensing, polarization, speckle pattern
SPIE - The International Society for Optical Engineering
Falak, Przemyslaw Ludwik
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Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Sun, Qi
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Vettenburg, Tom
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Phillips, David
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Brambilla, Gilberto
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Beresna, Martynas
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23 May 2023
Falak, Przemyslaw Ludwik
f414a5d1-34e8-429d-8f9a-f203b6d83324
Lee, Timothy
beb3b88e-3e5a-4c3f-8636-bb6de8040fcc
Sun, Qi
66e3c3df-5a60-4927-a47a-c4f6020c2fc0
Vettenburg, Tom
7bf2aadc-de2c-489e-8466-48f13595ceb2
Phillips, David
96ee79d3-d922-4f85-ac56-f4196c9377fb
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Falak, Przemyslaw Ludwik, Lee, Timothy, Sun, Qi, Vettenburg, Tom, Phillips, David, Brambilla, Gilberto and Beresna, Martynas
(2023)
Magnetic field sensing using laser written birefringent scattering medium.
Wuilpart, Marc and Caucheteur, Christophe
(eds.)
In European Workshop on Optical Fibre Sensors, EWOFS 2023: European Workshop on Optical Fibre Sensors (EWOFS 2023) 23-26 May 2023.
vol. 12643,
SPIE - The International Society for Optical Engineering.
4 pp
.
(doi:10.1117/12.2678130).
Record type:
Conference or Workshop Item
(Paper)
Abstract
We demonstrate a polarization analyser based on processing of speckle patterns generated by a scattering medium. Each speckle pattern at a given wavelength and polarization state is unique and deterministic, and thus the polarization angle alters the speckle pattern motif. The polarization state of a given input light is obtained using reconstructive linear algebra methods. The system consists of a femtosecond laser written scattering chip and a CMOS sensor and contains no moving parts, making the proposed solution is low-cost and compact. The linear polarization angle was accurately reconstructed over a 0-20° test range, with 6 arcminutes (1/10° ) standard error. To demonstrate an application as a polarimeter, we used the system to measure Faraday rotation in a SF59 lead silicate glass within an electromagnet. The magnetic field was successfully traced by determining the induced changes in the input beam’s linear polarization angle in the range 0-80 mT with 10 mT standard error.
Text
EWOFS_2023_Manuscript
- Accepted Manuscript
More information
Published date: 23 May 2023
Additional Information:
Funding Information:
This work was supported by the EPSRC grant EP/S013776/1.
© (2023) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Venue - Dates:
EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS 2023, Wallonia Conference Centre Mons (WCCM), Mons, Belgium, 2023-05-23 - 2023-05-26
Keywords:
Faraday rotation, Optical scattering, magnetic field sensing, polarization, speckle pattern
Identifiers
Local EPrints ID: 477119
URI: http://eprints.soton.ac.uk/id/eprint/477119
ISSN: 0277-786X
PURE UUID: d6664060-8266-45cf-8574-4fc3cd4ea697
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Date deposited: 30 May 2023 16:30
Last modified: 18 Mar 2024 02:27
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Contributors
Author:
Przemyslaw Ludwik Falak
Author:
Qi Sun
Author:
Tom Vettenburg
Author:
David Phillips
Editor:
Marc Wuilpart
Editor:
Christophe Caucheteur
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