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. 2017 Oct 30;8:1184. doi: 10.1038/s41467-017-01382-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Experimental layout for integrated and spectral terahertz measurements. Broadband terahertz radiation is generated from the liquid in the cuvette via laser-induced filamentation. The terahertz radiation is collected and collimated by an off-axis parabola (OAP₁) filtered by a silicon filter (SF). The terahertz beam is then focused onto a PED by OAP₂ at focus F₁ for integrated measurements. A combination of filters is used before PED to minimize mid-IR radiation. A wire-grid polarizer can be inserted between OAP₁ and OAP₂, for terahertz polarization measurements. For spectrum measurements, the PED is removed from F₁, and the terahertz beam is steered using OAP₃ into a Michelson interferometer (consisting of mirrors M₁, M₂, and pellicle beam-splitter BS) for FAC measurements using the same PED placed at F₂ (focus of OAP₄)