Search results for "GUI"
showing 10 items of 12462 documents
Frequency conversion of propagating surface plasmon polaritons by organic molecules
2008
We demonstrate frequency conversion of surface plasmon polaritons (SPP) by utilizing the coupling between organic dye molecules and SPP. Launching of SPPs into a plasmonic waveguide is done in two ways: by optically excited molecules and by quantum dots (QDs). QDs are demonstrated to overcome the major problem of bleaching occurring with molecules. The SPP propagates tens of micrometers and clear frequency conversion is observed in the SPP spectrum after passing an area of converter molecules. The use of molecules and QDs as elements of all-plasmonic devices has the potential for high integration and use of self-assembly in fabrication. Peer reviewed
High-order modes in cavity-resonator-integrated guided-mode resonance filters (CRIGFs)
2015
International audience; Cavity-resonator-integrated guided-mode resonance filters (CRIGFs) are optical filters based on weak coupling by a grating between a free-space propagating optical mode and a guided mode, like guided-mode resonance filters (GMRFs). As compared to GMRFs they offer narrowband reflection with small aperture and high angular acceptance. We report experimental characterization and theoretical modeling of unexpected high-order reflected modes in such devices. Using coupled-mode modeling and moiré analysis we provide physical insight on key mechanisms ruling CRIGF properties. This model could serve as a simple and efficient framework to design new reflectors with tailored s…
Conditions for waveguide decoupling in square-lattice photonic crystals
2004
We study coupling and decoupling of parallel waveguides in two-dimensional square-lattice photonic crystals. We show that the waveguide coupling is prohibited at some wavelengths when there is an odd number of rows between the waveguides. In contrast, decoupling does not take place when there is even number of rows between the waveguides. Decoupling can be used to avoid cross talk between adjacent waveguides.
Coupling evanescently low loss Silicon-on-insulator ridge waveguides including high Q nanocavities for light control
2011
Summary form only given. In this work, we propose an innovative way to achieve an air-slotted nanocavities by coupling evanescently low loss Silicon-on-insulator (SOI) ridge waveguides(WGs) including high Q nanocavities exhibiting an ultrasmall modal volume V. We first show that coupling two WGs allows us to achieve a field confinement within the air slot as low as lambda/30 while preserving a high group index of the guided modes. Then we demonstrate that merging such coupled WGs with state-of-the-art high-Q/small V nanocavities is a robust way to achieve a single compact (1 µm × 3 µm) air-slotted resonator on substrate. Finally, we extend the concept to multiple air-slotted resonator syste…
Purcell-enhancement of the radiative PL decay in perylenediimides by coupling with silver nanoparticles into waveguide modes
2017
In this work, an interesting approach to enhance the coupling between excitons and plasmons is proposed by integrating highly luminescent perylenediimides (PDIs) and Ag metal nanoparticles (MNPs) in the core of a multilayer dielectric waveguide. The combination of the weak plasmonic coupling and the high scattering of MNPs gives rise to a significant improvement of the PDI photoluminescence and Purcell factor (PF) in forward-scattering geometry. Furthermore, when the PDI-MNP system is used as the core of a multilayer waveguide, a Purcell factor enhancement larger than 10 is observed, which is explained by an increase in the exciton-plasmon coupling under the light confinement in the wavegui…
Coût et financement des services éducatifs en République de Guinée
1985
Référence interne : 85028Rapport complémentaire du Rapport EFM/132
Interest Rates and Net Interest Margins: The Impact of Monetary Policy
2017
In this chapter, we examine the determinants of bank net interest margin, focusing on the effect of interest rates, and thus monetary policy decisions. The analysis is carried with a panel of banks from 32 OECD countries over the period 2003–2014. The results show a quadratic relationship between net interest margins and interest rates, implying that the variation of the latter has a greater effect when interest rates are low. An important policy implication of the results is that there is a trade-off between economic growth and financial stability associated with the impact of expansionary monetary policy when the level of interest rates is very low. As a result, if the current scenario of…
Renouveau de la présidence Obama à mi-mandat ?
2011
International audience; Le chômage de masse et les déséquilibres budgétaires sont les principaux obstacles à la réélection de Barack Obama en 2012. A-t-on assisté en deux ans à l’échec d’une « greffe » progressiste sur une culture politique américaine dans laquelle certains voient un conservatisme incontournable ?
Better Access to Terminology for Crisis Communications
2016
International audience; Crisis management depends on efficient communications with professional staff and with people who are affected by the crisis. The correct interpretation of general language and technical terms is crucial to take good actions and to save valuable time. To reduce the risk of misunderstandings we need a well-established crisis management terminology. Several collections of terms have been prepared for hazard areas such as pollution, radiation, fire safety, and dangerous goods. Today such terminologies can be provided on different websites, depending on how the national crisis management is organised. This distribution and a variation of different formats and user interf…
Testimonio y visualidad. De la visión del ciego a las imágenes del vacío
2017
¿Cuál es la relación entre testimonio y visualidad? ¿De qué forma se ha dado testimonio visual de la violencia de Estado? ¿De qué modo las imágenes pueden capturar o representar la experiencia del derrumbe, de la desestructuración y del vacío que caracteriza a la vivencia histórica de la represión militar? Este trabajo trata de abordar esas preguntas a partir de dos ejemplos concretos de diferente naturaleza, pero que permiten plantear algunas cuestiones mayores sobre la relación entre testimonio y visualidad. Se trata de ejemplos lejanos en el tiempo, pero vinculados por su rechazo a pensar la testimonialidad visual desde el paradigma de la referencialidad. La vastísima obra pictórica de G…