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.
We present an absolute-frequency THz dual-comb spectrometer based on electro-optic modulators that provides dynamic spectroscopic measurements with a temporal resolution of 1ms. This feature is complemented by ultra-narrow linewidth teeth and total control over central and repetition frequencies.
We present a frequency THz Dual-Comb spectrometer based on electro-optic modulators that provides multi-octave fast interrogation in the THz range (20GHz - ITHz). The architecture is easily tunable and also offers dynamic spectroscopic information with a resolution of 1ms. This feature is complemented by ultra-narrow linewidth teeth and total control over central and repetition frequencies.
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