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THZ amplification based on impurity-band transitions In Si/GeSi heterostructures
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2008 (English)In: Proceedings of CAOL 2008, 2008, 422-424 p.Conference paper, Published paper (Refereed)
Abstract [en]

Terahertz stimulated emission based on impurity-band optical transitions of phosphor donor centers embedded in Si/GeSi heterostructures is reported. THz emission was measured from selectively doped Si/GeSi structures excited by CO2 laser radiation. Amplification of 8-9 THz emission with the coefficient of 2-3 cm-1 is obtained for structures with gently strained selectively doped Si layers (Nd ≈ 1017 cm -3) under pump density of 200 kW/cm2. Corresponding net gain taking into account small overlapping of active layer with THz mode is estimated to be ∼ 200-300 cm-1. Experimental data demonstrate the possibility to use impurity-band transitions for THz laser action. The capability of Si/GeSi quantum cascade scheme which can support inverted population on donor-continuum transitions of Si conduction band is also analyzed.

Place, publisher, year, edition, pages
2008. 422-424 p.
Series
Proceedings of CAOL 2008: 4th International Conference on Advanced Optoelectronics and Lasers
Keyword [en]
Amplification, Si/SiGe heterostructures, THz radiation, Carbon dioxide, Carbon monoxide, Crystals, Electric conductivity, Electron mobility, Heterojunctions, Lasers, Active layers, Band transitions, Continuum transitions, Donor centers, Doped si, Experimental datums, Net gains, Quantum cascades, Terahertz, THz emissions, Thz lasers
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-154145DOI: 10.1109/CAOL.2008.4671971Scopus ID: 2-s2.0-57849167209ISBN: 9781424419746 (print)OAI: oai:DiVA.org:kth-154145DiVA: diva2:756461
Conference
4th International Conference on Advanced Optoelectronics and Lasers, CAOL 2008, 29 September 2008 through 4 October 2008, Alushta, Crimea
Note

QC 20141017

Available from: 2014-10-17 Created: 2014-10-14 Last updated: 2014-10-17Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
  • en-GB
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  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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  • asciidoc
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