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Title:PHOTONICS-BASED TERAHERTZ SOURCES FOR MOLECULAR SPECTROSCOPY
Author(s):Lampin, Jean-François
Subject(s):Mini-symposium: Far-Infrared Spectroscopy
Abstract:\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.3]{Spectrum.eps} \end{wrapfigure} Since twenty years photonics-based terahertz (THz) sources have made great progress. They are now usable for low- and high-resolution molecular spectroscopy in the 0.1-4 THz range (3-130 \wn). We will present the principles of near-infrared laser-based THz set-ups: time-domain spectroscopy (see figure showing ambient pressure \chem{H_2O} lines) and frequency-domain photomixing. Then we will review the different types of high bandwidth semiconductors photodetectors used to convert laser beams into THz beams. Two families are mainly used: photoconductors and photodiodes. Advantages and drawbacks of each will be presented. The subject of THz antennas will be also discussed and a state of the art will be given including the devices developed at IEMN. Some example of molecular spectroscopy measurements using these devices at various frequencies and resolutions will be given. Finally new ways for photonics-based THz sources will be exposed.
Issue Date:06/20/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100736
DOI:10.15278/isms.2018.WI01
Other Identifier(s):WI01
Date Available in IDEALS:2018-08-17
2018-12-12


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