5 September 2014 THz QCL self-mixing interferometry for biomedical applications
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Abstract
In this paper, we introduce the self-mixing phenomenon in terahertz quantum cascade lasers (THz QCLs) and present recent advancements in the development of coherent THz imaging and sensing systems that exploit the self-mixing effect. We describe an imaging method which utilises the interferometric nature of optical feedback in a THz QCL to employ it as a homodyning transceiver. This results in a highly sensitive and compact scheme. Due to the inherently low penetration depth of THz radiation in hydrated biological tissue, imaging of superficial skin is an ideal application for this technique. We present results for imaging of excised skin tissue, showing high-contrast between different tissue types and pathologies.
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Aleksandar D. Rakić, Aleksandar D. Rakić, Thomas Taimre, Thomas Taimre, Karl Bertling, Karl Bertling, Yah Leng Lim, Yah Leng Lim, Stephen J. Wilson, Stephen J. Wilson, Milan Nikolić, Milan Nikolić, Alexander Valavanis, Alexander Valavanis, Dragan Indjin, Dragan Indjin, Edmund H. Linfield, Edmund H. Linfield, A. Giles Davies, A. Giles Davies, Blake Ferguson, Blake Ferguson, Graeme Walker, Graeme Walker, Helmut Schaider, Helmut Schaider, H. Peter Soyer, H. Peter Soyer, } "THz QCL self-mixing interferometry for biomedical applications", Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990M (5 September 2014); doi: 10.1117/12.2061433; https://doi.org/10.1117/12.2061433
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