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Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres

Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres
Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres
Glass fibres with silicon cores have emerged as a versatile platform for all-optical processing, sensing and microscale optoelectronic devices. Using SiGe in the core extends the accessible wavelength range and potential optical functionality because the bandgap and optical properties can be tuned by changing the composition. However, silicon and germanium segregate unevenly during non-equilibrium solidification, presenting new fabrication challenges, and requiring detailed studies of the alloy crystallization dynamics in the fibre geometry. We report the fabrication of SiGe-core optical fibres, and the use of CO2 laser irradiation to heat the glass cladding and recrystallize the core, improving optical transmission. We observe the ramifications of the classic models of solidification at the microscale, and demonstrate suppression of constitutional undercooling at high solidification velocities. Tailoring the recrystallization conditions allows formation of long single crystals with uniform composition, as well as fabrication of compositional microstructures, such as gratings, within the fibre core.
1-9
Coucheron, David
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Fokine, Michael
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Patil, Nilesh
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Werner Breiby, Dag
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Tore Buset, Ole
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Healy, Noel
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Peacock, Anna C.
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Hawkins, Thomas
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Jones, Max
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Ballato, John
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Gibson, Ursula
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Coucheron, David
350eac59-d6ba-4c0a-90cd-658fcf9376e1
Fokine, Michael
fb6ef706-b6fc-4aab-a295-b41f6561c7c8
Patil, Nilesh
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Werner Breiby, Dag
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Tore Buset, Ole
edda2759-d80d-4077-92c5-c9cf17c3e7fe
Healy, Noel
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Peacock, Anna C.
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Hawkins, Thomas
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Jones, Max
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Ballato, John
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Gibson, Ursula
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Coucheron, David, Fokine, Michael, Patil, Nilesh, Werner Breiby, Dag, Tore Buset, Ole, Healy, Noel, Peacock, Anna C., Hawkins, Thomas, Jones, Max, Ballato, John and Gibson, Ursula (2016) Laser recrystallization and inscription of compositional microstructures in crystalline SiGe-core fibres. Nature Communications, 7 (13265), 1-9. (doi:10.1038/ncomms13265).

Record type: Article

Abstract

Glass fibres with silicon cores have emerged as a versatile platform for all-optical processing, sensing and microscale optoelectronic devices. Using SiGe in the core extends the accessible wavelength range and potential optical functionality because the bandgap and optical properties can be tuned by changing the composition. However, silicon and germanium segregate unevenly during non-equilibrium solidification, presenting new fabrication challenges, and requiring detailed studies of the alloy crystallization dynamics in the fibre geometry. We report the fabrication of SiGe-core optical fibres, and the use of CO2 laser irradiation to heat the glass cladding and recrystallize the core, improving optical transmission. We observe the ramifications of the classic models of solidification at the microscale, and demonstrate suppression of constitutional undercooling at high solidification velocities. Tailoring the recrystallization conditions allows formation of long single crystals with uniform composition, as well as fabrication of compositional microstructures, such as gratings, within the fibre core.

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Accepted/In Press date: 14 September 2016
e-pub ahead of print date: 24 October 2016
Published date: 24 October 2016
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 401977
URI: https://eprints.soton.ac.uk/id/eprint/401977
PURE UUID: 9f9321ac-8e20-4d4c-b0e2-8298187e803e
ORCID for Anna C. Peacock: ORCID iD orcid.org/0000-0002-1940-7172

Catalogue record

Date deposited: 26 Oct 2016 12:41
Last modified: 03 Dec 2019 01:50

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