Terahertz characterisation
About
Terahertz characterisation - PLATERA platform: Terahertz (50 GHz – 4 THz) characterization and imaging of materials and devices by using Time or Frequency Domain methods. Temporally characterization of phenomena and dynamics in the picosecond range.
Description
The Terahertz characterisation – PLATERA platform (https://www.platera.tech/) enables us to study the properties of materials and devices at frequencies between 50 GHz and 4 THz, and to temporally characterize phenomena and dynamics in the picosecond range.
THz waves are highly sensitive to the presence of free charges and to vibrational/rotational modes of molecules (e.g. water vapor). Thus, THz waves are useful for measurement of doping level in semiconductors wafers, dielectric characterization of materials (solid or thin-film), non-destructive testing, etc…. Combined with pulsed laser sources (femtosecond lasers in the UV- VIS- NIR range), THz pulses can also be used to study the dynamics of non-equilibrium systems (optical pump/THz probe experiments) at sub-nanosecond scales. Finally, imaging systems (camera, point-to-point scanned image) combined with the use of broadband or tunable THz sources enable multispectral imaging applications.
For these various applications, the PLATERA platform is equipped with the following instruments:
– 2 multispectral THz imagers
– 1 frequency-resolved THz spectroscopy system (50 GHz – 2.5 THz)
– 2 broadband time-domain-spectroscopy systems (100 GHz – 4 THz)
– THz camera
– THz power meters
– a frequency-tunable single-frequency source (200 GHz- 1 THz)
– an optical pump / THz probe time domain characterization bench (with optical pump of 70 fs ranging from 300 nm to 1600 nm)
– an experimental bench for measuring picosecond optoelectronic impulse response at 780 or 1560 nm.
Technical specifications:
Frequency range: 50 GHz – 4 THz (typically)
Samples size: mm to several cm
Optional:
Coutaz, J.-L., Garet, F., & Wallace, V. (2018). Principles of Terahertz Time-Domain Spectroscopy (1st ed.). Jenny Stanford Publishing. https://doi.org/10.1201/b22478
M. Bernier, F. Garet, J. -L. Coutaz, H. Minamide and A. Sato, “Accurate Characterization of Resonant Samples in the Terahertz Regime Through a Technique Combining Time-Domain Spectroscopy and Kramers–Kronig Analysis,” in IEEE Transactions on Terahertz Science and Technology, vol. 6, no. 3, pp. 442-450, May 2016, doi: 10.1109/TTHZ.2016.2535244.
L. Duvillaret, F. Garet and J. . -L. Coutaz, “A reliable method for extraction of material parameters in terahertz time-domain spectroscopy,” in IEEE Journal of Selected Topics in Quantum Electronics, vol. 2, no. 3, pp. 739-746, Sept. 1996, doi: 10.1109/2944.571775.
L. Duvillaret, F. Garet, and J. Coutaz, “Highly precise determination of optical constants and sample thickness in terahertz time-domain spectroscopy,” Appl. Opt. 38, 409-415 (1999).
L. Duvillaret, F. Garet, J. . -F. Roux and J. . -L. Coutaz, “Analytical modeling and optimization of terahertz time-domain spectroscopy experiments, using photoswitches as antennas,” in IEEE Journal of Selected Topics in Quantum Electronics, vol. 7, no. 4, pp. 615-623, July-Sept. 2001, doi: 10.1109/2944.974233.
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