Aymeric RAMIERE, Dr.

Aymeric_RAMIERE.jpg Host Laboratory NOMURA LAB.
Position in LIMMS Postdoctoral Researcher
Main Research Topic in LIMMS

NANOTECH - Thermal Conductance of phononic crystals at ultra-low temperature

Keywords

Thermal Conductance, Phononic crystals

Contact LIMMS/CNRS-IIS (UMI 2820)
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Phone:+81 (0)3 5452 6036 / Fax:+81 (0)3 5452 6088
E-mail  ramiere at iis.u-tokyo.ac.jp

Resume

Short resume :
2015-Present JSPS postdoc in LIMMS
2012-2015 PhD student in LIMSI (UPR CNRS 3251, Université Paris Sud)

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Research Projects in Limms

1- Thermal Conductance of phononic crystals at ultra-low temperature

Context :

Structuring a crystal with a periodic pattern changes the speed of sound in the crystal creating a frequency range in which acoustic wave cannot propagate (band gap). These novel materials are called phononic crystals. They are intended to master heat transfer in material by controlling the heat carriers namely phonons.  

Today, nanofabrication technologies allow us to design patterns down to 50 nm so that the band gap is located in GHz frequencies. At room temperature phonons have around THz frequencies and the band gap has no impact on heat transport. But if we cool the phononic crystal down to ultra-low temperature  20mK (-273.1°C) using a dilution refrigerator, the phonon frequencies matches the band gap frequency range. Therefore we expect to measure a significant attenuation of the thermal conductance.

Aymeric_Fig1.png

Band structure of air hole phononic crystal.


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Main publication List(papers, conferences and patent)

2016

Journals
Conferences
  1. R. Anufriev, A. Ramiere, J. Maire and M. Nomura, “Directional heat flow engineering by phononic nanostructures,” Eurotherm 108 Nanoscale and Microscale Heat Transfer V, Santorini, Greece (2016).
  2. R. Anufriev, A. Ramiere, J. Maire and M. Nomura, “Ballistic thermal emission and heat focusing by silicon phononic nanostructures,” the 76th JSAP Fall Meeting 2016, Niigata, September (2016).
  3. A. Ramiere, R. Yanagisawa and M. Nomura, “Phonon mean free path distribution and thermal conduction in 1D phononic crystals,” the 76th JSAP Fall Meeting 2016, Niigata, September (2016).
  4. Nanoscale and Microscale Heat Transfer V, Eurotherm Seminar No 108, September 26-30 2016, Santorini, Greece
    -Poster: Mean free path analysis in phononic crystals (1st author)
    -Talk: Heat guiding and focusing in phononic crystal nanostructures (2nd author)

2015

Journals
Conferences

2014

Journals
Conferences

2013 and prior

Journals
Conferences

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