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Proceedings Paper

THz QCL self-mixing interferometry for biomedical applications
Author(s): Aleksandar D. Rakić; Thomas Taimre; Karl Bertling; Yah Leng Lim; Stephen J. Wilson; Milan Nikolić; Alexander Valavanis; Dragan Indjin; Edmund H. Linfield; A. Giles Davies; Blake Ferguson; Graeme Walker; Helmut Schaider; H. Peter Soyer
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Paper 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.

Paper Details

Date Published: 5 September 2014
PDF: 12 pages
Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990M (5 September 2014); doi: 10.1117/12.2061433
Show Author Affiliations
Aleksandar D. Rakić, The Univ. of Queensland (Australia)
Thomas Taimre, The Univ. of Queensland (Australia)
Karl Bertling, The Univ. of Queensland (Australia)
Yah Leng Lim, The Univ. of Queensland (Australia)
Stephen J. Wilson, The Univ. of Queensland (Australia)
Milan Nikolić, The Univ. of Queensland (Australia)
Alexander Valavanis, Univ. of Leeds (United Kingdom)
Dragan Indjin, Univ. of Leeds (United Kingdom)
Edmund H. Linfield, Univ. of Leeds (United Kingdom)
A. Giles Davies, Univ. of Leeds (United Kingdom)
Blake Ferguson, Queensland Institute of Medical Research (Australia)
Graeme Walker, Queensland Institute of Medical Research (Australia)
Helmut Schaider, The Univ. of Queensland, School of Medicine (Australia)
H. Peter Soyer, The Univ. of Queensland, School of Medicine (Australia)


Published in SPIE Proceedings Vol. 9199:
Terahertz Emitters, Receivers, and Applications V
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)

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