Terahertz imaging through self-mixing in a quantum cascade laser

Paul Dean, Yah Leng Lim, Alex Valavanis, Russell Kliese, Milan Nikolic, Suraj P. Khanna, Mohammad Lachab, Dragan Indjin, Zoran Ikonic, Paul Harrison, Aleksandar D. Rakic, Edmund H. Linfield, A. Giles Davies

Research output: Contribution to journalArticlepeer-review

144 Citations (Scopus)


We demonstrate terahertz (THz) frequency imaging using a single quantum cascade laser (QCL) device for both generation and sensing of THz radiation. Detection is achieved by utilizing the effect of self-mixing in the THz QCL, and, specifically, by monitoring perturbations to the voltage across the QCL, induced by light reflected from an external object back into the laser cavity. Self-mixing imaging offers high sensitivity, a potentially fast response, and a simple, compact optical design, and we show that it can be used to obtain high-resolution reflection images of exemplar structures.

Original languageEnglish
Pages (from-to)2587-2589
Number of pages3
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2011
Externally publishedYes


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