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Highly sensitive detection of broadband terahertz waves using aqueous salt solutions. | LitMetric

AI Article Synopsis

  • Recent advancements in water-based coherent detection of terahertz (THz) waves show improved performance compared to solid and air detection methods, addressing bandwidth limitations and lower energy requirements.
  • The method successfully extends to aqueous salt solutions, where sensitivity can be greatly enhanced, with signal intensity linked to the third-order nonlinear susceptibility (χ) and the linear refractive index (η).
  • Both coherent and incoherent detection methods demonstrate a positive correlation with solution concentration, suggesting that liquid-based THz detection could be a valuable technique for measuring physicochemical properties of various liquids in the THz range.

Article Abstract

Water-based coherent detection of broadband terahertz (THz) wave has been recently proposed with superior performances, which can alleviate the limited detection bandwidth and high probe laser energy requirement in the solid- and air-based detection schemes, respectively. Here, we demonstrate that the water-based detection method can be extended to the aqueous salt solutions and the sensitivity can be significantly enhanced. The THz coherent detection signal intensity scales linearly with the third-order nonlinear susceptibility χ or quadratically with the linear refractive index η of the aqueous salt solutions, while the incoherent detection signal intensity scales quadratically with χ or quartically with η, proving the underlying mechanism is the four-wave mixing. Both the coherent and incoherent detection signal intensities appear positive correlation with the solution concentration. These results imply that the liquid-based THz detection scheme could provide a new technique to measure χ and further investigate the physicochemical properties in the THz band for various liquids.

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Source
http://dx.doi.org/10.1364/OE.472753DOI Listing

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