Romain Ladret

 PhD, UPMC Univ Paris 06
 romain.ladret(at)centralesupelec.fr
 

Now at: SAGEM

Former activity at GeePs:

Worked on a research project associated to the ANR Blanc 2011 project MASTHER (Miniaturized All-Solid state Terahertz HEterodyne Receiver, 2011-2015)

Background:

Assistant Engineer at ONERA – 3 month long internship, 2009
Assistant Engineer at CEA – 6 month long internship, 2010
Engineer and Master Degree in Optronics at the “Institut d’Optique Graduate School”, 2010
Engineer in optronics at SAGEM under ALTEN service contract, 2010

PhD subject

Ultra-sensitive nano-detectors for terahertz receiver applications (PhD supervisor : A. Kreisler, co-supervisor: A. Dégardin); Started on Jan. 2012; Finished on Dec. 2014; Defended on 6 July 2016
Keywords: High temperature superconductors. Thin films. Nanotechnologies. Far-IR /THz radiation detectors. Hot electron bolometers. Optical instrumentation.

Some recent publications:

1. R. Ladret, A.J. Kreisler & A.F. Dégardin, “YBCO-Constriction Hot Spot Modeling: DC and RF Descriptions for HEB THz Mixer Noise Temperature and Conversion Gain,” IEEE Trans. Appl. Supercond. 25 (3), p. 2300505 (2015).

2. R.G. Ladret, A.F. Dégardin & A.J. Kreisler, “YBaCuO HEB hot-spot model with non-uniform RF power: absorption: THz mixing frequency-dependent performance,” IRMMW-THz 2015, IEEE Proc. DOI: 10.1109/IRMMW-THz.2015.7327695

3. R.G. Ladret, A.J. Kreisler & A.F. Dégardin, “High-Tc micro and nano-constriction modelling: hot spot approach for DC characteristics and HEB THz mixer performance,” J. Phys.: Conf. Ser. 507, p. 042020 (2014).

4. R. G. Ladret, A. F. Dégardin & A. J. Kreisler, "Nano-patterning and hot spot modeling of YBCO ultrathin film constrictions for THz mixers," IEEE Trans. Appl. Supercond. 23(3), p. 23003305 (2013).

5. R. G. Ladret, A.J. Kreisler & A.F. Dégardin, “Superconducting high-Tc hot electron bolometers used as THz mixers: predicted performance by hot spot modeling,” IRMMW-THz 2013 IEEE Proc. DOI 10.1109/IRMMW-THz.2013.6665541.

Some recent presentations:

1. R.G. Ladret, A.F. Dégardin & A.J. Kreisler, “ Non-uniform RF power absorption in superconducting constrictions: Application to YBaCuO HEB hot spot model with THz frequency-dependent performance,” 12th European Conference on Applied Superconductivity (EUCAS 2015), Lyon, France (6-10 September 2015), Poster # 2A-E-P-01.05.

2. R. Ladret, A.J. Kreisler, A.F. Dégardin, "Terahertz superconducting hot electron bolometers: technological issues and predicted mixer performance for Y-Ba-Cu-O devices", SPIE Europe Security + Defence, Amsterdam, NL (22 September 2014), Poster, SPIE Proc. 9252, pp. 92520RD-1/12 (2014).

3. R.G. Ladret, A.J. Kreisler & A.F. Dégardin, “YBCO-constriction hot spot modeling: DC and RF descriptions for HEB THz mixer noise temperature, conversion loss and bandwidth”, characteristics and HEB THz mixer performance,” Applied Superconductivity Conference (ASC 2014), Charlotte, USA (10-15 August 2014), Poster #3EPo2H-E-01.

4. R. Ladret, A. Kreisler & A. Dégardin, “Bolomètres supraconducteurs à électrons chauds utilisés comme mélangeurs THz : performances de l’YBaCuO par un modèle hot spot,” 13èmes Journées de Caractérisation Micro-ondes et Matériaux (JCMM 2014), Nantes (24 – 26 mars 2014), présentation orale.

5. R. G. Ladret, A.J. Kreisler & A.F. Dégardin, “High-Tc micro and nano-constriction modelling: hot spot approach for DC characteristics and HEB THz mixer performance,” European Conference on Applied Superconductivity (EUCAS 2013), Genova, Italie (15-19 September 2013), Poster #2P-EL3-14.

6. R. G. Ladret, A.J. Kreisler & A.F. Dégardin, “Superconducting high-Tc hot electron bolometers used as THz mixers: predicted performance by hot spot modeling,” International Conference on Infrared, Millimeter and THz Waves (IRMMW-THz 2013), Mainz, Allemagne (1-6 September 2013), Oral presentation #MO8-3.