Towards Hyperspectral Dual-Comb Imaging

Martín-Mateos, Pedro; Guarnizo, Guillermo

doi:10.1364/fts.2019.fw5b.2

Cited by 2 publications

(1 citation statement)

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“…The architecture presented here can be configured to generate and detect THz combs in a frequency range that goes from a few tens of GHz up to roughly 1.2 THz with freely adjustable optical resolution (down to a single www.nature.com/scientificreports/ Hz 22 ) and span, exceptional simplicity and an inherently high mutual coherence that enables integration times of up to few hundreds of a second without active stabilization. The main limitation of the current system is evidently the long time needed for the acquisition of the hypercube; nevertheless, recent dual-comb developments promise to overcome current technological challenges to consistently shrink acquisition times to a single second in the next few years 37,38 . Besides this, we plan to incorporate spectral processing and classification to the next versions of the system for the identification and quantification of analytes with distinctive absorption spectrum 39 .…”

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confidence: 99%

Hyperspectral terahertz imaging with electro-optic dual combs and a FET-based detector

Martín-Mateos

Čibiraitė-Lukenskienė

Barreiro

et al. 2020

Sci Rep

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in this paper, a terahertz hyperspectral imaging architecture based on an electro-optic terahertz dual-comb source is presented and demonstrated. in contrast to single frequency sources, this multiheterodyne system allows for the characterization of the whole spectral response of the sample in parallel for all the frequency points along the spectral range of the system. this hence provides rapid, highly consistent results and minimizes measurement artifacts. the terahertz illumination signal can be tailored (in spectral coverage and resolution) with high flexibility to meet the requirements of any particular application or experimental scenario while maximizing the signal-to-noise ratio of the measurement. Besides this, the system provides absolute frequency accuracy and a very high coherence that allows for direct signal detection without inter-comb synchronization mechanisms, adaptive acquisition, or post-processing. Using a field-effect transistor-based terahertz resonant 300 GHz detector and the raster-scanning method we demonstrate the two-dimensional hyperspectral imaging of samples of different kinds to illustrate the remarkable capabilities of this innovative architecture. A proof-of-concept demonstration has been performed in which tree leaves and a complex plastic fragment have been analyzed in the 300 GHz range with a frequency resolution of 10 GHz.

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Section: Discussionmentioning

confidence: 99%

Hyperspectral terahertz imaging with electro-optic dual combs and a FET-based detector

Martín-Mateos

Čibiraitė-Lukenskienė

Barreiro

et al. 2020

Sci Rep

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Direct hyperspectral dual-comb gas imaging in the mid-infrared

2020

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In this Letter, we present and experimentally validate the first direct hyperspectral dual-comb gas imaging system operating in the mid-infrared region. This method provides an unmatched combination of super-fine spectral characterization and high temporal resolution without the need for thermal contrast between the target molecules and the background. In a proof-of-concept experiment, the system has allowed us to perform precision hyperspectral imaging of butane in the 3.4 µm band with a time resolution of 1 s.

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Towards Hyperspectral Dual-Comb Imaging

Cited by 2 publications

References 5 publications

Hyperspectral terahertz imaging with electro-optic dual combs and a FET-based detector

Hyperspectral terahertz imaging with electro-optic dual combs and a FET-based detector

Direct hyperspectral dual-comb gas imaging in the mid-infrared

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