Jean-Michel Le Floch

Associate Professor

Phone: (027) 87543880


Academic Areas: High-frequency electronics engineering

Research Interests: Apply quantum and microwave technologies together for developing sensing instruments


In 2007, he was working as an engineer at XLIM research institute from the French National Centre for Scientific Research (CNRS) in Limoges on microwave devices for telecommunication companies. In 2008, he was an Australian Research Council postdoctoral fellow with a ARC International linkage scheme in the Frequency Standards and Metrology (FSM) Group located in the School of Physics at UWA in Perth. Then in 2009, he has been appointed with a 3-year position as an ARC APD in the FSM Group then followed by a two-year contract as a research associate where his current work involves designing low phase noise oscillators at extremely high frequencies (EHF), and generate very high stable source in millimeter waves. Since 2012, he has been appointed to work on material characterization of new samples for quantum physics experiments such as spin interactions and single photons at milli-Kelvin temperature. In 2014, he finally found interest in applying quantum and microwave technologies together for developing sensing instruments. He is currently looking for new opportunities in biology, and medical domains. He developed hybrid systems for ODMR and strong coupling interface with diamond and nano-diamond towards quantum information and engineering low-cost MRI sensors of parasites such as malaria and schistosomiasis, two deadliest parasites on Earth in equatorial regions. In 2015, first, he has been visiting professor at Huazhong University of Science and Technology (HUST) and then he took in September an associate professor position to build a cryogenic sapphire oscillator.

Academic Degrees

2007 Double-badged PhD in High frequencies and Optoelectronics Engineering and Physics, The University of Limoges, in France and The University of Western Australia, in Australia -- Very High Distinction

Title: Design of High-Q factor dielectric resonators for metrology application.

Description: This thesis explored the idea of Bragg resonators for building very-high Q-factor devices for room temperature metrology applications.

Professional Experience


2015 – present: Associate Professor, Center for Gravitational Experiments - School of Physics, Huazhong University of Science and Technology, People’s Republic of China.


2008 – 2014: Research Assistant Professor, Frequency Standards and Metrology Group - School of Physics, The University of Western Australia, Australia.


2007 – 2008: Contracted Engineer, National Centre for Scientific Research (CNRS) - UMR6172 XLIM Research institute, The University of Limoges, France.

Selected Publications

  1. Farr, W., Goryachev, M., Le Floch, S.R., Le Floch, J-M., M.E. Tobar, "Evidence of dilute ferromagnetism in rare-earth doped yttrium aluminium garnet," Applied Physics Letters, 122401, doi:10.1063/1.4931432, 2015
  2. Goryachev, M., Farr, W.G., Carmo Carvalho, N.D., Creedon, D.L., Le Floch, J-M., Probst, S., Bushev, P., Tobar, M.E., "Discovery of iron group impurity ion spin states in single crystal Y2SiO5 with strong coupling to whispering gallery photons," Applied Physics Letters, 106(23), 232401, doi:10.1063/1.4922376, 2015
  3. Carvalho, N.C., Le Floch, J.-M., Krupka, J., Tobar, M.E., "Multi-mode technique for the determination of the biaxial Y2SiO5 permittivity tensor from 300 to 6 K," Applied Physics Letters, 106(19), 192904, doi:10.1063/1.4920987, 2015
  4. Creedon, D.L., Le Floch, J.-M., Goryachev, M., Farr, W.G., Castelletto, S., Tobar, M.E., "Strong coupling between P1 diamond impurity centers and a three-dimensional lumped photonic microwave cavity," Physical Review B - Condensed Matter and Materials Physics, 91(14), 140408, doi:10.1103/PhysRevB.91.140408, 2015
  5. Probst, S., Tkalcec, A., Rotzinger, H., Rieger, D., Le Floch, J-M., Goryachev, M., Tobar, M.E., Ustinov, A. V., Bushev, P. A., "Three-dimensional cavity quantum electrodynamics with a rare-earth spin ensemble," Physical Review B - Condensed Matter and Materials Physics, 90(10), 100404, doi:10.1103/PhysRevB.90.100404, 2014
  6. Le Floch, J.-M., Bradac, C., Nand, N., Castelletto, S., Tobar, M.E., Volz, T., "Addressing a single spin in diamond with a macroscopic dielectric microwave cavity," Applied Physics Letters, 105(13), 133101, doi:10.1063/1.4896858, 2014
  7. Queffelec, P., Laur, V., Chevalier, A., Le Floch, J.-M., Passerieux, D., Cros, D., Madrangeas, V., Le Febvrier, A., Députier, S., Guilloux-Viry, M., Houzet, G., Lacrevaz, T., Bermond, C., Fléchet, B., "Intercomparison of permittivity measurement techniques for ferroelectric thin layers," Journal of Applied Physics, 115(2), 024103, doi:10.1063/1.4858388, 2014
  8. Nand, N.R., Goryachev, M., Le Floch, J.-M., Creedon, D.L., Tobar, M.E., "Hyperparametric effects in a whispering-gallery mode rutile dielectric resonator at liquid helium temperatures," Journal of Applied Physics, 116(13), 134105, doi:10.1063/1.4897164, 2014
  9. Le Floch, J.-M., Fan, Y., Humbert, G., Shan, Q., Férachou, D., Bara-Maillet, R., Aubourg, M., Hartnett, J.G., Madrangeas, V., Cros, D., Blondy, J.-M., Krupka, J., Tobar, M.E., "Invited article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures," Review of Scientific Instruments, 85(3), 6838804, doi:10.1063/1.4867461, 2014
  10. Nand, N.R., Parker, S.R., Ivanov, E.N., Le Floch, J.-M., Hartnett, J.G., Tobar, M.E., "Resonator power to frequency conversion in a cryogenic sapphire oscillator," Applied Physics Letters, 103(4), 043502, doi:10.1063/1.4816284, 2013
  11. Benmessai, K., Farr, W.G., Creedon, D.L., Reshitnyk, Y., Le Floch, J.-M., Duty, T., Tobar, M.E., "Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+ in sapphire," Physical Review B - Condensed Matter and Materials Physics, 87(9), 094412, doi:10.1103/PhysRevB.87.094412, 2013
  12. Le Floch, J.-M., Bara, R., Hartnett, J.G., Tobar, M.E., Mouneyrac, D., Passerieux, D., Cros, D., Krupka, J., Goy, P., Caroopen, S., "Electromagnetic properties of polycrystalline diamond from 35 K to room temperature and microwave to terahertz frequencies," Journal of Applied Physics, 109(9), 094103, doi:10.1063/1.3580903, 2011
  13. Hartnett, J.G., Mouneyrac, D., Krupka, J., Le Floch, J.-M., Tobar, M.E., Cros, D., "Microwave properties of semi-insulating silicon carbide between 10 and 40 GHz and at cryogenic temperatures," Journal of Applied Physics, 109(6), 064107, doi:2011082901123256, 2011

Selected Cases

Awards and Honors

• National Natural Science Foundation of China , Grant No. 91536109

Courses Taught

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