Search results for "Antenne"
showing 6 items of 6 documents
Antennes universitaires : quels effets sur les parcours étudiants ? Le cas de la filière AES au Creusot (71)
2009
09026; Suite à l'« explosion » des effectifs universitaires, de nombreuses antennes ont vu le jour à la fin des années 1980. Il convient maintenant d'évaluer leurs effets sur les parcours étudiants. Notre recherche porte sur la filière AES au sein de l'université de Bourgogne. Dans cet article, nous comparerons successivement le recrutement, la réussite en DEUG et le parcours ultérieur des étudiants de l'antenne du Creusot par rapport à ceux de l'université centrale de Dijon. Nous verrons que l'antenne permet une ouverture sociale au niveau du recrutement, que la réussite y est un peu meilleure et que les parcours ultérieurs ne diffèrent pas entre les deux publics étudiants.
A measurement-based channel model for vehicular communications in tunnels
2014
Wireless Communications and Networking Conference (WCNC), 2014 IEEE, Istanbul, TURQUIE, 06-/04/2014 - 09/04/2014; In this paper, we present a new version of the iterative nonlinear least square approximation (INLSA) algorithm for the design of measurement-based channel simulators. The proposed method aims to match the time-variant impulse response (TVIR) of the simulation model to that of the measured channel. The propagation delays are discerned directly from the measurements, whereas the gains, the Doppler frequencies, and the phases are computed iteratively by minimizing a matching error norm. We evaluate the performance of the proposed method in terms of the approximation of the transfe…
ELECTRON-FED OPTICAL ANTENNA
2019
Nanoscale electronics and photonics are among the most promising research areas providing functional nanocomponents for data transfer and signal processing. By adopting metal-based optical antennas as a disruptive technological vehicle, we demonstrate that an optical antenna coupled to a tunnel junction can be interfaced to create an electronically driven self-emitting unit. This nanoscale plasmonic transmitter operates by injecting electrons in a contacted tunneling antenna feedgap. Under certain operating conditions, we show that the device radiates a broadband light spectrum which can be related to a thermal like spectrum. We propose a model based upon the spontaneous emission of hot ele…
Contrôle de nano-antennes optiques par une commande électrique : tuner plasmonique et transduction
2011
Optical nano-antennae are the new class of components to control light/matterinteraction at the nanoscale. These devices are operating in the visible to near infraredpart of the spectrum. The properties of these nano objects are controlled by theform, the size and the material.In the radio frequency domain, the tuner changes dynamically the operatingwavelength of the antenna. In this thesis work, we search to transfer this conceptto the nanoscale. The principle is to change the load impedance of the antenna, i.e.changing the optical index of the dielectric medium around the nano-object. Forthat we used anisotropic liquid cristal molecules. The value of the optical index iscontrolled by appl…
L'université plus près du "local", un "plus" pour les usagers ? Problèmes méthodologiques et premiers résultats d'une enquête sur l'antenne universit…
1994
International audience
Electrical control of the nonlinear properties of plasmonic nanostructures
2020
This work brings nano-electronics and nano-photonics technologies together to create an electron- plasmon device whose linear and nonlinear optical properties are electrically controlled. Here, we present the first demonstration of nonlinear photoluminescence modulation by electrical means in an uncluttered configuration. To this purpose, plasmonic nanoantennas are interfaced with elec- trical connections inducing localized regions of electron accumulation and depletion and therefore affecting the optical response. Additionally, a complete analysis of the nonlinear photoluminescence in plasmonic nanowires is carried out. The delocalization and transport of nonlinearities provided by such st…