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Proceedings Paper

Far-infrared (THz) electroluminescence from Si/SiGe quantum cascade heterostructures
Author(s): Stephen A. Lynch; Douglas J. Paul; Robert Bates; David J. Norris; Anthony G. Cullis; Zoran Ikonic; Robert W. Kelsall; Paul Harrison; Donald D. Arnone; Carl R. Pidgeon
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Paper Abstract

There is strong interest in the development of sources that emit radiation in the far infrared (1-10 THz) frequency range for applications which include early detection of skin cancer, dental imaging, telecommunications, security scanning, gas sensing, astronomy, molecular spectroscopy, and the possible detection of biological weapons. While a number of THz sources are available, there are at present no compact, efficient, cheap and practical high-power solid-state sources such as light emitting diodes or lasers. Silicon is an excellent candidate for such a THz source since the lack of polar optical phonon scattering makes it an inherently low loss material at these frequencies. Furthermore, since over 97% of all microelectronics is presently silicon based, the realisation of a silicon based emitter/laser could potentially allow integration with conventional silicon-based microelectronics. In this paper THz electroluminescence from a Si/SiGe quantum cascade structure operating significantly above liquid helium temperatures is demonstrated. Fourier transform infrared spectroscopy was performed using step scan spectrometer with a liquid helium cooled Si-bolometer for detection. Spectra are presented demonstrating intersubband electroluminescence at a number of different frequencies. These spectral features agree very well with the theoretically calculated intersubband transitions predicted for the structure.

Paper Details

Date Published: 27 August 2003
PDF: 10 pages
Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.463738
Show Author Affiliations
Stephen A. Lynch, Univ. of Cambridge (United Kingdom)
Douglas J. Paul, Univ. of Cambridge (United Kingdom)
Robert Bates, Univ. of Cambridge (United Kingdom)
David J. Norris, Univ. of Sheffield (United Kingdom)
Anthony G. Cullis, Univ. of Sheffield (United Kingdom)
Zoran Ikonic, Univ. of Leeds (United Kingdom)
Robert W. Kelsall, Univ. of Leeds (United Kingdom)
Paul Harrison, Univ. of Leeds (United Kingdom)
Donald D. Arnone, TeraView Ltd. (United Kingdom)
Carl R. Pidgeon, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4876:
Opto-Ireland 2002: Optics and Photonics Technologies and Applications
Vincent Toal; Norman Douglas McMillan; Gerard M. O'Connor; Eon O'Mongain; Austin F. Duke; John F. Donegan; James A. McLaughlin; Brian D. MacCraith; Werner J. Blau, Editor(s)

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