Harvesting, coupling and control of single exciton coherences in photonic waveguide antennas

We perform coherent non-linear spectroscopy of individual excitons strongly confined in single InAs quantum dots (QDs). The retrieval of their intrinsically weak four-wave mixing (FWM) response is enabled by a one-dimensional dielectric waveguide antenna. Compared to a similar QD embedded in bulk media, the FWM detection sensitivity is enhanced by up to four orders of magnitude, over a broad operation bandwidth. Three-beam FWM is employed to investigate coherence and population dynamics within individual QD transitions. We retrieve their homogenous dephasing in a presence of spectral wandering. Two-dimensional FWM reveals off-resonant F\"orster coupling between a pair of distinct QDs embedded in the antenna. We also detect a higher order QD non-linearity (six-wave mixing) and use it to coherently control the FWM transient. Waveguide antennas enable to conceive multi-color coherent manipulation schemes of individual emitters.Comment: 7 pages, 8 Figure

Fano resonances in plasmonic core-shell particles and the Purcell effect

Despite a long history, light scattering by particles with size comparable with the light wavelength still unveils surprising optical phenomena, and many of them are related to the Fano effect. Originally described in the context of atomic physics, the Fano resonance in light scattering arises from the interference between a narrow subradiant mode and a spectrally broad radiation line. Here, we present an overview of Fano resonances in coated spherical scatterers within the framework of the Lorenz-Mie theory. We briefly introduce the concept of conventional and unconventional Fano resonances in light scattering. These resonances are associated with the interference between electromagnetic modes excited in the particle with different or the same multipole moment, respectively. In addition, we investigate the modification of the spontaneous-emission rate of an optical emitter at the presence of a plasmonic nanoshell. This modification of decay rate due to electromagnetic environment is referred to as the Purcell effect. We analytically show that the Purcell factor related to a dipole emitter oriented orthogonal or tangential to the spherical surface can exhibit Fano or Lorentzian line shapes in the near field, respectively.Comment: 28 pages, 10 figures; invited book chapter to appear in "Fano Resonances in Optics and Microwaves: Physics and Application", Springer Series in Optical Sciences (2018), edited by E. O. Kamenetskii, A. Sadreev, and A. Miroshnichenk

Crustal types and Tertiary tectonic evolution of the Alborán sea, western Mediterranean

Multichannel seismic reflection images across the transition between the east Alborán and the Algero-Balearic basins show how crustal thickness decreases from about 5 s two-way traveltime (TWTT, ∼15 km thick) in the west (east Alborán basin) to ∼2 s TWTT typical of oceanic crust (∼6 km thick) in the east (Algero-Balearic basin). We have differentiated three different crustal domains in this transition, mainly on the basis of crustal thickness and seismic signature. Boundaries between the three crustal domains are transitional and lack evidence for major faults. Tilted blocks related to extension are very scarce and all sampled basement outcrops are volcanic, suggesting a strong relationship between magmatism and crustal structure. Stratigraphic correlation of lithoseismic units with sedimentary units of southeastern Betic basins indicates that sediments onlap igneous basement approximately at 12 Ma in the eastern area and at 8 Ma in the western area. Linking seismic crustal structure with magmatic geochemical evidence suggests that the three differentiated crustal domains may represent, from west to east, thin continental crust modified by arc magmatism, magmatic-arc crust, and oceanic crust. Middle to late Miocene arc and oceanic crust formation in the east Alborán and Algero-Balearic basins, respectively, occurred during westward migration of the Gibraltar accretionary wedge and shortening in the Betic-Rif foreland basins. Arc magmatism and associated backarc oceanic crust formation were related to early to middle Miocene subduction and rollback of the Flysch Trough oceanic basement. Subduction of this narrow slab beneath the Alborán basin was coeval with collision of the Alborán domain with the Iberian and African passive margins and subsequent subcontinental-lithosphere edge delamination along the Betic-Rif margins

Rapports de la caféine, des cendres et du manganèse dans les cafés.

Juillet A., Delga J. Rapports de la caféine, des cendres et du manganèse dans les cafés.. In: Revue de botanique appliquée et d'agriculture coloniale, 22ᵉ année, bulletin n°254-256, Octobre-novembre-décembre 1942. pp. 460-466

La série saumâtre et continentale d'âge Miocène moyen et supérieur d'Eivissa (ex-Ibiza, Baléares)

At first, it is recalled that the main tectonics of Eivissa (Ibiza) involves white marls of upper Burdigalian- lower Langhian, with abundant planktonic microorganisms. But, near the south-west promontory of the island, in a site discovered a century ago by Vidai and Molina (1888), one find directly transgressive on the Senonian, polygenic conglomerates, then a sandy marly formation with Bivalvia (Cmssos- crea gryphoides, Mytilus aquitanicus, ...) and few benthic Foraminifera, finally coaly clays with brackish or estuary Gastropods. This "Formation of Cap Jueu" has also provided Langhian-like scarce paiynological assemblages. Strata of the same sedimentary cycle, also involved in the tangential tectonics, may be pointed out at the top of the imbrication of Roques Altes (ex- Rocas Altas), South West of la Talaia of Sant Josep (ex- San José) and near ant Rafael, maybe dating from the Tortonian (?) by microflora. It is possible to group here the "top conglomerates" from the center of the island, which lie up to Tnas, but usually ravining lower Langhian marls. So, an independent sedimentary cycle, prior to paroxysmal tectonics, dated as "middle" - ? upper Miocene (Langhian to ? Tortonian), may be defined, which goes before the deposit of marine "upper" Tortonian (Limestones of Portinatx), posterior to the main compressive phase. Clayey interstratifications in these limestones have provided poor paiynological assemblages corresponding to this Tortonian age. In short, the Miocene from Eivissa shows three independent sedimentary cycles which enable to date tectonic episodes concerning this eastern extension of Betic Cordilleras