Nonlinear spectroscopy at terahertz frequencies

Kareem J. Garriga Francis; Mervin Lim Pac Chong; Yiwen E.; Xi-Cheng Zhang

doi:10.1117/12.2575255

10 October 2020 Nonlinear spectroscopy at terahertz frequencies

Kareem J. Garriga Francis, Mervin Lim Pac Chong, Yiwen E., Xi-Cheng Zhang

Proceedings Volume 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII; 1155906 (2020) https://doi.org/10.1117/12.2575255
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

Nonlinear THz spectroscopy extends the full-phase analysis of traditional THz-TDS onto the high-intensity regime. With THz sources reaching peak electric fields in excess of hundreds of kV/cm, it is now possible to induce large index changes in some materials. In the case of liquid water, a nonlinear index of 7.8x10-10 cm2/W is confirmed. This value is large enough to break the perturbative regime when sources with peak electric fields in the MV/cm range are used. In addition, the spectrally resolved nonlinear index dispersion can also be extracted.

Conference Presentation

Citation Download Citation

Kareem J. Garriga Francis, Mervin Lim Pac Chong, Yiwen E., and Xi-Cheng Zhang "Nonlinear spectroscopy at terahertz frequencies", Proc. SPIE 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII, 1155906 (10 October 2020); https://doi.org/10.1117/12.2575255

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