Photonics-based terahertz sources for molecular spectroscopy
Lampin, Jean-François
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https://hdl.handle.net/2142/100736
Description
Title
Photonics-based terahertz sources for molecular spectroscopy
Author(s)
Lampin, Jean-François
Issue Date
2018-06-20
Keyword(s)
Mini-symposium: Far-Infrared Spectroscopy
Abstract
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 cm−1 ).
We will present the principles of near-infrared laserbased THz set-ups: time-domain spectroscopy (see figure showing ambient pressure H2O lines) and frequencydomain 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 photonicsbased THz sources will be exposed.
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