Concept

Miroir de Bragg

Publications associées (152)

Effects of Maxwell-Wagner polarization on soil complex dielectric permittivity under variable temperature and electrical conductivity

The presence of free charges and numerous discontinuities separating liquid, gas, and solid phases in partially saturated soils give rise to Maxwell-Wagner polarization that may significantly affect bulk dielectric permittivity measurements. Evidence sugge ...

2006

First mirror tests for ITER: influence of material choice on the deposition/ erosion mechanisms affecting optical reflectivity

Richard Pitts

Almost all optical diagnostics systems on ITER will be based on in-vessel metallic first mirrors. The possible deterioration of their surface reflectivity as a result of erosion by charge-exchange neutrals and re-deposition of material eroded from the plas ...

2006

Sol-gel deposition of nanostructured low refractive index materials on solar collector glazing

Jean-Louis Scartezzini, Christian Roecker, Josef Andreas Schuler, Estelle De Chambrier, Dipanwita Dutta

Nanoporous SiO2 and nanocomposite MgF2:SiO2 coatings have been deposited by sol gel dip-coating in a particle-free atmosphere. The refractive index of the prepared nanostructured thin films is determined from spectrophotometric data. In both cases, signifi ...

2006

Thin film multilayer design types for colored glazed thermal solar collectors

Jean-Louis Scartezzini, Andreas Schueler, Christian Roecker, Estelle De Chambrier

Multilayered inteference filters of dielectric thin films have been designed for the application as energy-efficient coloration of collector cover glasses. The optical behavior of the designed multilayers is analyzed by computer simulations yielding the CI ...

2005

Supercapacitive Admittance Tomoscopy

Hubert Girault, Jean-Pierre Abid

A sensor for measuring adsorption on a substrate has been designed including a contactless detection scheme, called supercapacitive admittance tomoscopy (SCAT). The sensor comprises a thin dielectric layer with two parallel band electrodes on the one side ...

2005

Fabrication of vertical digital silicon optical micromirrors on suspended electrode for guided-wave optical switching applications

Philippe Renaud, Cyrille Hibert, Philippe Flückiger, Roland Guerre

This paper presents a novel technological and design study of optical guided- wave MicroElectroMechanical Systems (MEMS) switch. We work on a concept of hermetic assembly in which a MEMS wafer is covered (top-down) by a crossing optical waveguide wafer. Th ...

2005

Recent progress in the growth of highly reflective nitride-based distributed Bragg reflectors and their use in microcavities

Nicolas Grandjean, Jean-François Carlin, Marc Ilegems, Raphaël Butté, Eric Feltin, Gabriel Christmann, Julien Dorsaz

The growth of highly-reflective nitride-based distributed Bragg reflectors (DBRs) and their use in vertical cavity structures is reviewed. We discuss the various nitride material systems employed to design Bragg mirrors and microcavities, namely the Al-x(G ...

2005

Effect of spontaneous polarization screening on dielectric response of ferroelectric polydomain films

Nava Setter, Alexander Tagantsev, Pavel Mokry

A theoretical study on the effect of spontaneous polarization screening on the dielectric response of ferroelectric films with 180 degrees domains going through the film thickness (through-domains) is presented. It has been shown by several researchers tha ...

2005

From Mirroring to Guiding: A Review of State of the Art Technology for Supporting Collaborative Learning

Patrick Jermann

We review a representative selection of systems that support the management of collaborative learning interaction, and characterize them within a simple classification framework. The framework distinguishes between mirroring systems, which display basic ac ...

2005

Bi-directional transmission properties of Venetian blinds: experimental assessment compared to ray-tracing calculations

Marilyne Andersen, Jean-Louis Scartezzini

An accurate evaluation of daylight distribution through advanced fenestration systems (complex glazing, solar shading systems) requires the knowledge of their Bidirectional light Transmission (Reflection) Distribution Function BT(R)DF. An innovative equipm ...

2005

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Connectez-vous pour utiliser Chat avec Graph Search