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Photonics 2018, 5(2), 11; https://doi.org/10.3390/photonics5020011

Broadband Terahertz Light–Matter Interaction Enhancement for Precise Spectroscopy of Thin Films and Micro-Samples

IEMN, CNRS, Univ. Lille, 59652 Villeneuve d’Ascq, France
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Received: 16 February 2018 / Revised: 30 March 2018 / Accepted: 14 May 2018 / Published: 17 May 2018
(This article belongs to the Special Issue Microwave Photonics 2017)
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Abstract

In biology, molecules and macromolecules such as sugars, proteins, DNA, RNA, etc., are of utmost importance. Detecting their presence as well as getting information on their actual structure is still a challenge in many cases. The vibrational states of such molecules correspond to a spectral range extending from infrared to terahertz. Spectroscopy is used for the detection and the identification of such compounds and their structure. Terahertz spectroscopy of a biosample is challenging for two main reasons: the high terahertz absorption by water molecules in the sample; and the small size of the sample—its volume is usually smaller than the cube of the terahertz wavelength, thus the light–matter interaction is extremely reduced. In this paper, we present the design, fabrication, characterization, and first typical use of a biophotonic device that aims to increase the light–matter interaction to enable terahertz spectroscopy of very small samples over a broad band (0.2–2 THz). Finally, we demonstrate the validity of our approach by time-domain spectroscopy of samples of a few µL. View Full-Text
Keywords: biophotonic; terahertz; time domain spectroscopy; absorption enhancement; laser cutting biophotonic; terahertz; time domain spectroscopy; absorption enhancement; laser cutting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Peretti, R.; Braud, F.; Peytavit, E.; Dubois, E.; Lampin, J.-F. Broadband Terahertz Light–Matter Interaction Enhancement for Precise Spectroscopy of Thin Films and Micro-Samples. Photonics 2018, 5, 11.

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