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

David A. Coucheron, Michael Fokine, Nilesh Patil, Dag Werner Breiby, Ole Tore Buset, Noel Healy, Anna C. Peacock, Thomas Hawkins, Max Jones, John Ballato and Ursula J. Gibson ()
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David A. Coucheron: Høgskoleringen 5, NTNU, Norwegian University of Science and Technology
Michael Fokine: KTH Royal Institute of Technology
Nilesh Patil: Høgskoleringen 5, NTNU, Norwegian University of Science and Technology
Dag Werner Breiby: Høgskoleringen 5, NTNU, Norwegian University of Science and Technology
Ole Tore Buset: Høgskoleringen 5, NTNU, Norwegian University of Science and Technology
Noel Healy: Optoelectronics Research Centre, University of Southampton, Highfield
Anna C. Peacock: Optoelectronics Research Centre, University of Southampton, Highfield
Thomas Hawkins: Clemson University
Max Jones: Clemson University
John Ballato: Clemson University
Ursula J. Gibson: Høgskoleringen 5, NTNU, Norwegian University of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13265

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