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Extreme electronic bandgap modification in laser-crystallized silicon optical fibres

Healy, Noel, Mailis, Sakellaris, Bulgakova, Nadezhda M., Sazio, Pier J.A., Day, Todd D., Sparks, Justin R., Cheng, Hiu Y., Badding, John V. and Peacock, Anna C. (2014) Extreme electronic bandgap modification in laser-crystallized silicon optical fibres Nature Materials, 13, (12), pp. 1122-1127.

Record type: Article

Abstract

For decades now, silicon has been the workhorse of the microelectronics revolution and a key enabler of the Information age. Owing to its excellent optical properties in the near- and mid-infrared, silicon is now promising to have a similar impact on photonics. The ability to incorporate both optical and electronic functionality in a single material offers the tantalizing prospect of amplifying, modulating and detecting light within a monolithic platform. However, a direct consequence of silicon's transparency is that it cannot be used to detect light at telecommunications wavelengths. Here, we report on a laser processing technique developed for our silicon fibre technology through which we can modify the electronic band structure of the semiconductor material as it is crystallized. The unique fibre geometry in which the silicon core is confined within a silica cladding allows large anisotropic stresses to be set into the crystalline material so that the size of the bandgap can be engineered. We demonstrate extreme bandgap reductions from 1.11 eV down to 0.59 eV, enabling optical detection out to 2,100nm.

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More information

Published date: 28 September 2014
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 372182
URI: http://eprints.soton.ac.uk/id/eprint/372182
ISSN: 1476-1122
PURE UUID: b98e2e48-9b6f-4aa2-95f9-ac781b8ab2d8
ORCID for Pier J.A. Sazio: ORCID iD orcid.org/0000-0002-6506-9266
ORCID for Anna C. Peacock: ORCID iD orcid.org/0000-0002-1940-7172

Catalogue record

Date deposited: 02 Dec 2014 11:11
Last modified: 09 Oct 2017 05:34

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Contributors

Author: Noel Healy
Author: Nadezhda M. Bulgakova
Author: Pier J.A. Sazio ORCID iD
Author: Todd D. Day
Author: Justin R. Sparks
Author: Hiu Y. Cheng
Author: John V. Badding
Author: Anna C. Peacock ORCID iD

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