Publications de Francis Lévy | EPFL Graph Search

Influence of gold particle size on the photocatalytic activity for acetone oxidation of Au/TiO2 catalysts prepared by dc-magnetron sputtering

Two series of Au/TiO2 materials with different gold content have been prepared by dc-magnetron sputtering on ceramic shaped pure anatase or Degussa P25 TiO2. The time of deposition was varied between 1 and 20 min in order to obtain different thickness and ...

2011

Nanoscale Optical Detector with Single-Photon and Multiphoton Sensitivity

Francis Lévy, Francesco Marsili, Alessandro Gaggero

We present the first nanoscale (down to approximate to 50 x 50 nm(2)) detector displaying single-photon sensitivity and a nanosecond response. This type of nanodetector can also be operated in multiphoton mode, where the detection threshold can be set at N ...

American Chemical Society (ACS)2010

High quality superconducting NbN thin films on GaAs

Francis Lévy, Alessandro Surrente, Francesco Marsili, Alessandro Gaggero

A very promising way to increase the detection efficiency of nanowire superconducting single-photon detectors (SSPDs) consists in integrating them with advanced optical structures such as distributed Bragg reflectors (DBRs) and optical waveguides. This req ...

2009

Superconducting nanowire photon-number-resolving detector at telecommunication wavelengths

Francis Lévy, Konstantinos Lagoudakis, Francesco Marsili, Alessandro Gaggero

Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can be linear or nonlinear. When high sensitivities are needed, single-photon detectors are used, which operate in a strongly nonlinear mode, their response being i ...

Nature Publishing Group2008

Film Growth and Epitaxy: Methods

Francis Lévy

Elsevier2005