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(468) Production(s) de l'année 2016
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The multipolar hamiltonian to model quantum metamaterialsin the visible range
Auteur(s): Rousseau E., Felbacq D.
Conférence invité: Quantum Metamaterials and Quantum Technology 2016 workshop (Spetses, GR, 2016-06-19)
Texte intégral en Openaccess :
Ref HAL: hal-01337693_v1
Exporter : BibTex | endNote
Résumé: This presentation adresses the question of the correct hamiltonian to describe a quantum metamaterials in the optical frequency range.
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Heterostructured hBN-BP-hBN Nanodetectors at Terahertz Frequencies.
Auteur(s): Viti Leonardo, Hu Jin, Coquillat D., Politano Antonio, Consejo C., Knap W., Vitiello Miriam s
(Article) Publié:
Advanced Materials, vol. p.1 (2016)
PMID 27315585
DOI: 10.1002/adma.201601736
WoS: 000383778700006
54 Citations
Résumé: By reassembling the thin isolated atomic planes of hexagonal borum nitride (hBN) with a few layer phosphorene (black phosphorus BP), hBN/BP/hBN heterostructures were mechanically stacked to devise high efficiency THz photodetectors operating in the 0.3-0.65 THz range, from 4K to 300K, with a record signal-to-noise ratio of 20000.
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Near-infrared III-nitride-on-silicon nanophotonic platform with microdisk resonators
Auteur(s): Roland I., Zeng Y., Checoury X., El Kurdi M., Sauvage S., Brimont C., Guillet T., Gayral B., Gromovyi M., Duboz J. Y., Semond F., de Micheli M. P., Boucaud P.
(Article) Publié:
Optics Express, vol. 24 p.9602-9610 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01334017_v1
DOI: 10.1364/OE.24.009602
WoS: WOS:000375259600045
Exporter : BibTex | endNote
19 Citations
Résumé: We have developed a nanophotonic platform with microdisks using epitaxial III-nitride materials on silicon. The two-dimensional platform consists of suspended waveguides and mushroom-type microdisks as resonators side-coupled with a bus waveguide. Loaded quality factors up to 80000 have been obtained in the near-infrared spectral range for microdisk diameters between 8 and 15 μm. We analyze the dependence of the quality factors as a function of coupling efficiency. We have performed continuous-wave second harmonic generation experiments in resonance with the whispering gallery modes supported by the microdisks.
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Enhancing carbon-nanotubes luminescence with the help of resonant hotspots
Auteur(s): Rousseau E., Beaufils C., Cassabois G.
Conférence invité: Advances in Photonics and Applications (Florence, IT, 2016-06-09)
Texte intégral en Openaccess :
Ref HAL: hal-01333418_v1
Exporter : BibTex | endNote
Résumé: In this talk we will present experimental results demonstrating enhancement of the luminescence of single carbon nanotubes with the help of a random surface of resonant metallic scatterers.
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Quantum metamaterials in the microwave and optical ranges
Auteur(s): Zagoskin A. m., Felbacq D., Rousseau E.
(Article) Publié:
Epj Quantum Technology, vol. 3 p.2 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01333403_v1
Ref Arxiv: 1601.06587
DOI: 10.1140/epjqt/s40507-016-0040-x
WoS: 000407193100001
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
22 Citations
Résumé: Quantum metamaterials generalize the concept of metamaterials (artificial optical media) to the case when their optical properties are determined by the interplay of quantum effects in the constituent 'artificial atoms' with the electromagnetic field modes in the system. The theoretical investigation of these structures demonstrated that a number of new effects (such as quantum birefringence, strongly nonclassical states of light, etc) are to be expected, prompting the efforts on their fabrication and experimental investigation. Here we provide a summary of the principal features of quantum metamaterials and review the current state of research in this quickly developing field, which bridges quantum optics, quantum condensed matter theory and quantum information processing.
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Nonequilibrium Casimir-Polder plasmonic interactions
Auteur(s): Bartolo N., Messina R., Dalvit Diego A. R., Intravaia Francesco
(Article) Publié:
-Physical Review A Atomic, Molecular, And Optical Physics [1990-2015], vol. 93 p.042111 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01332641_v1
Ref Arxiv: 1601.05549
DOI: 10.1103/PhysRevA.93.042111
WoS: WOS:000374519400002
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
3 Citations
Résumé: We investigate how the combination of nonequilibrium effects and material properties impacts on the Casimir-Polder interaction between an atom and a surface. By addressing systems with temperature inhomogeneities and laser interactions, we show that nonmonotonous energetic landscapes can be produced where barriers and minima appear. Our treatment provides a self-consistent quantum theoretical framework for investigating the properties of a class of nonequilibrium atom-surface interactions.
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Small angle neutron scattering contrast variationreveals heterogeneities of interactions in proteingels
Auteur(s): Banc A., Charbonneau C., Morel Marie-Hélène, Ramos L.
Conference: SoftComp Annual Meeting 2016 (Ancone, IT, 2016-06-08)
Ref HAL: hal-01332389_v1
Exporter : BibTex | endNote
Résumé: We propose a quantitative approach to probe the spatial heterogeneities of interactions in macromolecular gels, based on a combination of small angle X-ray (SAXS) and neutrons (SANS) scattering. We investigate the structure of model gluten protein gels and show that the gels display radically different SAXS and SANS profiles when the solvent is (at least partially) deuterated. The detailed analysis of the SANS signal as a function of the solvent deuteration demonstrates heterogeneities of sample deuteration at different length scales. The progressive exchange between the protons (H) of the proteins and the deuteriums (D) of the solvent is inhomogeneous and 60 nm large zones that are enriched in H are evidenced. In addition, at low protein concentration, in the sol state, solvent deuteration induces a liquid/liquid phase separation. Complementary biochemical and structure analyses show that the denser protein phase is more protonated and specifically enriched in glutenin, the polymeric fraction of gluten proteins. These findings suggest that the presence of H-rich zones in gluten gels would arise from thepreferential interaction of glutenin polymers through a tight network of non-exchangeable intermolecular hydrogen bonds.
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