Coherent detection of broadband terahertz pulses using ethanol-water mixtures

Wen Xiao; Minghao Zhang; Liangliang Zhang; Cunlin Zhang; X.-C. Zhang

doi:10.1117/12.2642165

16 December 2022 Coherent detection of broadband terahertz pulses using ethanol-water mixtures

Wen Xiao, Minghao Zhang, Liangliang Zhang, Cunlin Zhang, X.-C. Zhang

Proceedings Volume 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX; 123240U (2022) https://doi.org/10.1117/12.2642165
Event: SPIE/COS Photonics Asia, 2022, Online Only

Conference Poster

Abstract

We demonstrate terahertz (THz) coherent detection using ethanol and ethanol-water mixtures. Combined with the THz-induced second harmonic (TISH) radiated from the liquid plasma and the control second harmonic (CSH) generated by BBO crystal, when the polarization directions of the CSH and TISH beams are parallel, a measured time-resolved waveform of the THz field is obtained due to the four-wave mixing mechanism. Since the third-order nonlinear coefficient of ethanol is larger than that of pure water, our scheme further enhances the sensitivity and signal-to-noise ratio of coherent detection. Meanwhile, the amplitude of THz wave detected by ethanol-water mixtures were increased with the increase of the ethanol concentration. This work provides a new perspective for exploring the solute-solvent molecular interaction and lays an experimental foundation for the theoretical analysis of THz wave coherent detection of classical liquid containing hydrogen bonds.

Citation Download Citation

Wen Xiao, Minghao Zhang, Liangliang Zhang, Cunlin Zhang, and X.-C. Zhang "Coherent detection of broadband terahertz pulses using ethanol-water mixtures", Proc. SPIE 12324, Infrared, Millimeter-Wave, and Terahertz Technologies IX, 123240U (16 December 2022); https://doi.org/10.1117/12.2642165

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