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Terahertz Emission From Silicon-Germanium Quantum Cascades

Kelsall, R. W., Ikonic, Z., Harrison, P., Lynch, Stephen Anthony ORCID:, Bates, R., Paul, D. J., Norris, D. J., Liew, S. L., Cullis, A. G., Robbins, D. J., Murzyn, P., Pidgeon, C. R., Arnone, D. D. and Soref, R. A. 2003. Terahertz Emission From Silicon-Germanium Quantum Cascades. Presented at: Towards the First Silicon Laser - NATO Advanced Research Workshop, Trento, Italy, 21-26 September 2002. Published in: Pavesi, L., Gaponenko, S. and Dal Negro, L. eds. Towards the First Silicon Laser: Proceedings of the NATO Advanced Research Workshop. NATO Science Series , vol.VI (93) Dordrecht: Springer Netherlands, pp. 367-382. 10.1007/978-94-010-0149-6_33

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Whilst most present day efforts towards the realisation of a silicon based laser are focused on the near-infrared (telecommunications) wavelengths, one of the most promising technical approaches is that of a silicon-germanium (SiGe) quantum cascade laser (QCL) operating in the far-infrared or terahertz frequency range. Until recently, the terahertz band (1–10 THz) has proved relatively inaccessible for science and engineering applications since it lies above the present upper frequency limit of millimetre wave electronic based oscillators, and below the range of near and mid-infrared solid state lasers and detectors. However, there is currently a great deal of interest in the development of terahertz technology for imaging and sensing applications: terahertz pulsed imaging has been shown to be capable of detecting caries (the precursor of decay) in human teeth [1], and there are also promising signs that the method could be used to detect basal cell carcinoma (a common form of skin cancer) [2]. Many chemical and biological molecules have absorption lines in the THz band, and therefore applications are envisaged in chemical/biological detection and identification. THz imaging is also potentially suitable for baggage/personnel scanning for security applications, where it would provide a low-energy, non-ionising alternative to X-rays.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Springer Netherlands
ISBN: 9781402011948
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Last Modified: 24 Oct 2022 10:50

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