Fast terahertz imaging using a quantum cascade amplifier

Ren, Yuan and Wallis, Robert and Jessop, David Stephen and Degl'Innocenti, Riccardo and Klimont, Adam and Beere, Harvey E. and Ritchie, David A. (2015) Fast terahertz imaging using a quantum cascade amplifier. Applied Physics Letters, 107 (1). ISSN 0003-6951

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A terahertz (THz) imaging scheme based on the effect of self-mixing in a 2.9 THz quantum cascade (QC) amplifier has been demonstrated. By coupling an antireflective-coated silicon lens to the facet of a QC laser, with no external optical feedback, the laser mirror losses are enhanced to fully suppress lasing action, creating a THz QC amplifier. The addition of reflection from an external target to the amplifier creates enough optical feedback to initiate lasing action and the resulting emission enhances photon-assisted transport, which in turn reduces the voltage across the device. At the peak gain point, the maximum photon density coupled back leads to a prominent self-mixing effect in the QC amplifier, leading to a high sensitivity, with a signal to noise ratio up to 55 dB, along with a fast data acquisition speed of 20000 points per second.

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Journal Article
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Applied Physics Letters
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10 Jan 2018 14:32
Last Modified:
21 Sep 2023 02:19