Theory of extraordinary transmission of light through quasiperiodic arrays of subwavelength holes

By using a theoretical formalism able to work in both real and k-spaces, the physical origin of the phenomenon of extraordinary transmission of light through quasi-periodic arrays of holes is revealed. Long-range order present in a quasiperiodic array selects the wavevector(s) of the surface electromagnetic mode(s) that allows an efficient transmission of light through subwavelength holes.Comment: 4 pages, 4 figure

Los instrumentos de planificacion urbana al servicio del desarrollo comunal

61 p.El objetivo principal de esta monografía es presentar al lector los elementos principales que forman parte de los instrumentos de Planificación Urbana. Al mismo tiempo el efecto que tiene para la vida de la comunidad su real conocimiento. Para cumplir con el objetivo propuesto, se analizara la Ley general de Urbanismo y Construcciones y su respectiva ordenanza, para luego inferir desde su análisis los efectos y consecuencia para el desarrollo socio-económico de sus destinatarios

Transformation-Optics Description of Nonlocal Effects in Plasmonic Nanostructures

We develop an insightful transformation-optics approach to investigate the impact that nonlocality has on the optical properties of plasmonic nanostructures. The light-harvesting performance of a dimer of touching nanowires is studied by using the hydrodynamical Drude model, which reveals nonlocal resonances not predicted by previous local calculations. Our method clarifies the interplay between radiative and nonlocal effects in this nanoparticle configuration, which enables us to elucidate the optimum size that maximizes its absorption and field enhancement capabilitiesThis work was supported by the ESF plasmonbionanosense program, the Leverhulme Trust, and the Engineering and Physical Sciences Research Council (EPSRC

Las concesiones del subsuelo en Chile y su regimen registral especial en la legislacion chilena actual.

75 p.El presente proyecto de memoria al tratar de un análisis legal y doctrinal de los criterios aplicables al Sistema de Concesiones del Subsuelo de Bienes Nacionales de Publico y de su especial Régimen de Registro en Chile, tiene por objeto proporcionar información relevante para el derecho administrativo en cuanto a los criterios que se podrían utilizar para determinar el marco regulatorio de este tipo de contratos de concesi6n y su inscripción en el registro especial correspondiente. Se utiliza el método dogmático interpretativo y el método inductivo, para realizar desde un criterio y análisis general de los hechos descriptivos de relevancia jurídica, donde apunta nuestra investigación, para Ilegar a un resultado particular; utilizando como instrumentos de cognición documentos escritos, de carácter positivo, doctrinal y de carácter empírico que han sido pertinentes y de necesidad para la acertada solución del problema jurídico planteado

Plasmon-exciton-polariton lasing

Strong coupling of Frenkel excitons with surface plasmons leads to the formation of bosonic quasi-particles known as plasmon-exciton-polaritons (PEPs).Localized surface plasmons in nanoparticles are lossy due to radiative and nonradiative decays, which has hampered the realization of polariton lasing in a plasmonic system, i.e., PEP lasing. These losses can be reduced in collective plasmonic resonances supported by arrays of nanoparticles. Here we demonstrate PEP lasing in arrays of silver nanoparticles by showing the emergence of a threshold in the photoluminescence accompanied by both a superlinear increase of the emission and spectral narrowing. We also observe a reduction of the threshold by increasing the coupling between the molecular excitons and the resonances supported by the array despite the reduction of the quantum efficiency of the emitters. The coexistence of bright and dark collective modes in this plasmonic system allows for a 90?-change of polarization in the emission beyond the threshold

Geometrically induced modification of surface plasmons in the optical and telecom regimes

We demonstrate that the introduction of a subwavelength periodic modulation into a metallic structure strongly modifies the guiding characteristics of the surface plasmon modes supported by the system. Moreover, it is also shown how a new type of a tightly confined surface plasmon polariton mode can be created by just milling a periodic corrugation into a metallic ridge placed on top of a metal surface

Effects of IRF5 Lupus Risk Haplotype on Pathways Predicted to Influence B Cell Functions

Both genetic and environmental interactions affect systemic lupus erythematosus (SLE) development and pathogenesis. One known genetic factor associated with lupus is a haplotype of the interferon regulatory factor 5 (IRF5) gene. Analysis of global gene expression microarray data using gene set enrichment analysis identified multiple interferon- and inflammation-related gene sets significantly overrepresented in cells with the risk haplotype. Pathway analysis using expressed genes from the significant gene sets impacted by the IRF5 risk haplotype confirmed significant correlation with the interferon pathway, Toll-like receptor pathway, and the B-cell receptor pathway. SLE patients with the IRF5 risk haplotype have a heightened interferon signature, even in an unstimulated state (P = 0.011), while patients with the IRF5 protective haplotype have a B cell interferon signature similar to that of controls. These results identify multiple genes in functionally significant pathways which are affected by IRF5 genotype. They also establish the IRF5 risk haplotype as a key determinant of not only the interferon response, but also other B-cell pathways involved in SLE

Plasmon exciton-polariton lasing

Strong light-matter interaction leads to the appearance of new states, i.e. exciton-polaritons, with photophysical properties rather distinct from their constituents. Recent developments in fabrication techniques allow us to make metallic structures with strong electric field confinement in nanoscale mode volumes, allowing for a facile assembly of strongly coupled systems at room temperature based on a hybrid organic-plasmonic architecture. In this research, a planar array of metallic nano-antennas is covered by a polymer layer doped with organic molecules, achieving strong coupling of organic excitons with collective plasmonic resonances in the array. We use photoluminescence spectroscopy to measure an onset in nonlinear emission and polariton lasing in this system. At increasing molecular doping levels we observe an increase of the Rabi splitting caused by strong coupling and a concomitant decrease in the lasing threshold. This behavior is observed in spite of a strong reduction in the photoluminescence lifetime and the quantum yield of the dye. Using angular resolved photoluminescence spectroscopy, we measure the thermalization and condensation of plasmon-exciton-polaritons (PEPs) into a mode which is dark in the linear regime. These measurements can be interpreted in terms of stimulated scattering of PEPs at room temperature in the open cavity defined by the nano-antenna array [1, 2]. The lowest threshold that we measure is lower than previous values reported at room temperature in organic materials using microcavities. These results illustrate the potential of metamaterials and plasmonic systems for polariton lasing in spite of the inherent losses of metals