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(468) Production(s) de l'année 2016
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Etude de nanotubes hybrides par spectroscopies vibrationnelles
Auteur(s): Bantignies J.-L.![Auteur correspondant (Corresp.)](plugins/aigle//images/corresponding.gif)
Conférence invité: Ecole Thématique 2016 Porquerolles • Groupe français de Spectroscopie vibrationnelle (Porquerolles, FR, 2016-10-09)
Résumé: Etude de nanotubes hybrides par spectroscopies vibrationnelles
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Metal composite as backing for ultrasonic transducers dedicated to non-destructive measurements in hostile ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Boubenia Redha, Rosenkrantz Eric, Despetis F., Combette Philippe, Ferrandis Jean-Yves
Conference: 5th International Conference on Materials and Applications for Sensors and Transducers (IC-MAST2015) (Mykonos, GR, 2015-09-27)
Actes de conférence: IOP Conference Series: Materials Science and Engineering, vol. 108 p.012007 (2016)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-01952334_v1
DOI: 10.1088/1757-899X/108/1/012007
WoS: 000376204700007
Exporter : BibTex | endNote
Résumé: Our team is specialized in ultrasonic measurements in hostile environment especially under high temperatures. There is a need for acoustic transducers capable of continuous measurement at temperatures up to 700°C. To improve the performances of acoustic sensors we focus our works on the realisation and characterisation of transducer backings able to operate under very high temperature. Commercially, they are produced by the incorporation of tungsten powder in a plastic matrix, which limits the working temperature. The realisation of ultrasonic transducers for non-destructive measures at high temperatures requires adequate materials, manufacturing and assembly processes. To produce the backings, composites were made using very ductile metals such as tin and tungsten. These composites are manufactured by uniaxial hot pressing. First, we studied the influence of temperature and pressure on the densification of tin pellets. Then, several specimens made of tin/W were made and characterised by measuring the specific weight, speed and attenuation of sound. The acoustic measures were realised by ultrasonic spectroscopy. This test-bench was designed and tested on control samples of PMMA and on standard backings (epoxy / tungsten).
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Nitride nanophotonics from the deep ultra-violet to the near infrared: non-linear optics and microlasers ![hal link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Selles J., Brimont C., Guizal B., Gayral Bruno, Mexis M., Semond Fabrice, Roland Iannis, Zeng Yijia, Checoury Xavier, Boucaud Philippe, Guillet T.![Auteur correspondant (Corresp.)](plugins/aigle//images/corresponding.gif)
Conference: 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META'16) (Malaga, ES, 2016-07-25)
Texte intégral en Openaccess :
Ref HAL: hal-01951768_v1
Exporter : BibTex | endNote
Résumé: The recent developments of nitride nanophotonics, based on photonic crystal membrane nanocavities and microdisk resonators, pave the way to a novel nanophotonic platform. Here we present two recent achievements: first we demonstrate the room-temperature operation of a nitride microlaser emitting in the deep UV spectral range (=275 nm) with GaN/AlN multiple quantum wells. Secondly we tailor the second-harmonic generation of a cw near infra-red radiation coupled to a high quality factor photonic crystal cavity.
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Control of the generation and propagation of polariton condensates at 300K in ZnO microcavities ![hal link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Guillet T. , Hahe R., Gargoubi H., Brimont C., Guizal B., Jaziri Sihem, Bouchoule Sophie, Lafosse Xavier, Li Feng, Leroux Mathieu, Semond Fabrice, Zúñiga-Pérez Jesús
Conférence invité: 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META'16) (Malaga, ES, 2016-07-25)
Texte intégral en Openaccess :
Ref HAL: hal-01951085_v1
Exporter : BibTex | endNote
Résumé: The spatial dynamics of the formation of a polariton condensate under a tightly focused excitation is imaged through 2D near-field and far-field 2D tomography in a ZnO microcavity, up to room temperature. The modelling exhibits the role of the outwards polariton flux caused by the reservoir repulsion, that leads to a 3 to 10 fold increase of the condensation threshold and is imprinted in the shape of the polariton condensate
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