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INSTITUT DE PHYSIQUE ET DE CHIMIE DES MATERIAUX DE STRASBOURG
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Ultrafast Optics and Nanophotonics (DON) Research teams of DON Ultrafast dynamics of nanostructures and nano-objects (NanoFemto)

Ultrafast dynamics of nanostructures and nano-objects (NanoFemto)

Research Activity

Our research team is mainly interested in studying wide band-gap semiconductor nanostructures by femtosecond laser spectroscopy. Different aspects of the electron relaxation dynamics are accessible in experiments using ultra-short laser light pulses:

- The electron-spin dynamics may be tested taking advantage of the particular structure of electron states, which posses a well-defined total angular momentum or “pseudo-spin”. The selection rules of the optical transitions allow to inject carriers with a controlled spin into the samples and to follow their relaxation by using polarized light beams. The study of the spin evolution of charged carriers in semiconductors is motivated by the possibility to associate (in the same device) the electron spin for stocking of information and its charge for transportation of this information. The spin evolution of the charged carriers in a semiconductor is not only determined by the life time of a spin state but also by the coherent superposition of the different spin states and the time during which such a superposition may be maintained. We measure [1] the coherence time and the lifetime of spin states of electrons, holes, or of excitons in semiconductor nanostructures, such as quantum wells or quantum points of different compounds (GaAs, CdTe, CuCl, GaN). We develop for these studies experimental techniques of femtosecond spectroscopy as pump-probe and four-wave mixing, which are specific for the determination of the spin evolution.

- The geometry and the reduced dimensionality of the semiconductor nanostructures modify significantly the electron states and the processes, which govern their relaxation dynamics. Our earlier studies have allowed us to evidence the important role that plays the coupling between carriers and phonons in quantum wells containing quantum dots of CdZnTe. Actually, we examine the intra-band relaxation of electrons by optical-phonon emission on an ultra-short time scale (<100fs) .

- Today electronics is almost totally based on Silicon, but its optical properties are quite mediocre. To build silicon nanostructures in form of porous networks or of nanocrystals allows obtaining emission proprieties in the visible, which are particularly interesting for applications in optoelectronics. We are interested in optical amplification processes in silicon nanocrystals and measure in particular their gain. The final aim is to obtain an efficient material for the fabrication of laser sources, integrated into the electronic device .

- Our spectroscopic equipment for low temperature research allows us to characterize the optical properties of various materials that are developed at the IPCMS. In collaboration with the DCMI we are interested in bi-functional lamellar compounds, in which the emission properties of the organic material are associated to the magnetic properties of films of nickel or cobalt. We also study the photoluminescence of nanocrystals of titanium oxide (TiO2) because of their photo-catalytic properties. We have in particular shown that a decrease of the light emission intensity is correlated with temperature and the reactivity of the particles.

Research Activities

  • Semiconductor quantum dots : relaxation dynamics

  • Titanium Dioxyde Nanocrystals

  • Optical pumping and photonic applications of Si-based nanostructures

  • Spin Dynamics in Semiconductors

Team Members

Team leader

Pierre GILLIOT

Photo of M. Pierre GILLIOT
Directeur de Recherche (DR2) – CNRSIPCMS – Département d’Optique ultrarapide et de Nanophotonique (DON) 23 rue du Loess BP 43 Bureau : 3008 Strasbourg 67034 work Téléphone: +33 (0)3 88 10 71 49workFax: +33 (0)3 88 10 72 49workfax Courriel: INTERNET Website: page personnelle

 

Researchers and  Teachers :

Mathieu GALLART

Photo of M. Mathieu GALLART
Maítre de conférence (MC) – UNISTRAIPCMS – Département d’Optique ultrarapide et de Nanophotonique (DON) 23 rue du Loess BP 43 Bureau : 3008 Strasbourg 67034 work Téléphone: +33 (0)3 88 10 71 93workFax: +33 (0)3 88 10 72 49workfax Courriel: INTERNET Website: page personnelle

Pierre GILLIOT

Photo of M. Pierre GILLIOT
Directeur de Recherche (DR2) – CNRSIPCMS – Département d’Optique ultrarapide et de Nanophotonique (DON) 23 rue du Loess BP 43 Bureau : 3008 Strasbourg 67034 work Téléphone: +33 (0)3 88 10 71 49workFax: +33 (0)3 88 10 72 49workfax Courriel: INTERNET Website: page personnelle

 

Technical staff :

Marc ZIEGLER

Photo of M. Marc ZIEGLER
Ingénieur d’études (IE2) – CNRSIPCMS – Département d’Optique ultrarapide et de Nanophotonique (DON) 23 rue du Loess BP 43 Bureau : 3007 Strasbourg 67034 work Téléphone: +33 (0)3 88 10 71 93workFax: +33 (0)3 88 10 72 49workfax Courriel: INTERNET Website: page personnelle

 

PhD Students et Post-doctorates :

Maryna HRYTSAIENKO

Photo of Mme Maryna HRYTSAIENKO
DoctoranteIPCMS – Département d’Optique ultrarapide et de Nanophotonique (DON) Home 23 rue du Loess BP 43 Bureau 3007 Strasbourg 67034 home Téléphone: +33 (0)3 88 10 71 86work Courriel: INTERNET

Publications

2019
/

2018
[1]
B. Azeredo, A. Carton, C. Leuvrey, C. Kiefer, D. Ihawakrim, S. Zafairatos, M. Gallart, P. Gilliot, et B. P. Pichon, « Synergistic photo optical and magnetic properties of a hybrid nanocomposite consisting of a zinc oxide nanorod array decorated with iron oxide nanoparticles », Journal of Materials Chemistry C, vol. 6, no 39, p. 10502‑10512, 2018, doi:10.1039/c8tc02680g.
[2]
P. Farger, C. Leuvrey, M. Gallart, P. Gilliot, G. Rogez, J. Rocha, D. Ananias, P. Rabu, et E. Delahaye, « Magnetic and luminescent coordination networks based on imidazolium salts and lanthanides for sensitive ratiometric thermometry », Beilstein Journal of Nanotechnology, vol. 9, p. 2775‑2787, 2018, doi:10.3762/bjnano.9.259.
[3]
M. Gallart, T. Cottineau, B. Hönerlage, V. Keller, N. Keller, et P. Gilliot, « Temperature dependent photoluminescence of anatase and rutile TiO2 single crystals: Polaron and self-trapped exciton formation », Journal of Applied Physics, vol. 124, no 13, p. 133104, 2018, doi:10.1063/1.5043144.

1839302 HVHG5Z72 2017 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2016 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2015 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2014 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2013 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2012 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/
1839302 HVHG5Z72 2011 items 1 surface-science-reports year DESC 1 http://www.ipcms.unistra.fr/wp-content/plugins/zotpress/

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