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Mid-infrared light emission > 3 µm wavelength from tensile strained GeSn microdisks
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Millar, R. W., Dumas, D. C. S., Gallacher, K. F., Jahandar, P., MacGregor, C., Myronov, Maksym and Paul, D. J. (2017) Mid-infrared light emission > 3 µm wavelength from tensile strained GeSn microdisks. Optics Express, 25 (21). 25374. doi:10.1364/OE.25.025374 ISSN 1094-4087.
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Official URL: http://dx.doi.org/10.1364/OE.25.025374
Abstract
GeSn alloys with Sn contents of 8.4 % and 10.7 % are grown pseudomorphically on Ge buffers on Si (001) substrates. The alloys as-grown are compressively strained, and therefore indirect bandgap. Undercut GeSn on Ge microdisk structures are fabricated and strained by silicon nitride stressor layers, which leads to tensile strain in the alloys, and direct bandgap photoluminescence in the 3–5 µm gas sensing window of the electromagnetic spectrum. The use of pseudomorphic layers and external stress mitigates the need for plastic deformation to obtain direct bandgap alloys. It is demonstrated, that the optically pumped light emission overlaps with the methane absorption lines, suggesting that GeSn alloys are well suited for mid-infrared integrated gas sensors on Si chips.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Infrared sources, Germanium alloys, Tin alloys | ||||||
Journal or Publication Title: | Optics Express | ||||||
Publisher: | Optical Society of America | ||||||
ISSN: | 1094-4087 | ||||||
Official Date: | 5 October 2017 | ||||||
Dates: |
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Volume: | 25 | ||||||
Number: | 21 | ||||||
Article Number: | 25374 | ||||||
DOI: | 10.1364/OE.25.025374 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 11 October 2017 | ||||||
Date of first compliant Open Access: | 11 October 2017 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||
Grant number: | EP/N003225/1 |
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