Transmission and reflection characteristics of metal-coated optical fiber tip pairs

The optical transmission and reflection in between two metalized optical fiber tips is studied in the optical near-field and far-field domains. In addition to aluminum-coated tips for near-field scanning optical microscopy (NSOM), specifically developed gold-coated fiber tips cut by focused ion beam are investigated. Transverse transmission maps of subwavelength width clearly indicate optical near-field coupling between the tips for short tip distances and become essentially Gaussian-shaped for larger distances in the far-field regime. Moreover, concentric reflection fringes observed for NSOM-type tips illustrate the influence of the receiving fiber tip on the emission pattern of the source tip. © 2013 Optical Society of America OCIS codes: (350.3950) Micro-optics; (350.4238) Nanophotonics and photonic crystals; (180.4243) Near-field microscopy

Le travail des « 16-18 ans » : « Bricolage social » ou économie parallèle ? (débat)

Dans la ligne des hypothèses émises par Yves Barel dans son ouvrage La Marginalité sociale, le débat porte sur les enjeux sociaux du travail et du non-travail et sur l’impact sur la société dans son ensemble des nouveaux comportements vis-à-vis du travail.In reference to Yves Barel's book La Marginalité sociale, this debate concerns the issue of work and the impact of new work practices on society as a whole.En la prolongación de las hipótesis emitidas por Yves Barel en su obra: "La marginalidad social", el debate torna sobre los efectos sociales del trabajo y del no-trabajo, y sobre el impacto del conjunto de nuevos comportamientos de trabajo sobre la sociedad

Unidirectional light transmiission by two-layer nanostructures interacting via optical near-fields

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A sensor to measure flow rate in individual nanopore

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Scanning Thermal Microscopy (SThM) using micro-fabricated thermometric tip

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Improved Power Factor in Self-Substituted Fe 2 VAl Thermoelectric Thin Films Prepared by Co-sputtering

International audienceWe present a strong improvement of the electronic transport properties in the Fe 2 VAl Heusler alloy obtained in thin film form by a co-sputtering process. The power factor is improved when deposition occurs at temperatures close to 873 K and when composition is tuned using a co-sputtering process. High values up to 5.6 mW/K 2 m are obtained for n-type films deposited at 873 K which is up to now a record for self-substituted Fe 2 VAl thermoelectric thin films. Influence of the co-sputtering conditions on atomic composition as well as substrate effect on electronic transport properties are also presented

Scanning Thermal Microscopy using tips functionalized with a NbN thermometer

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