Publications associées à Reaching the ultimate performance limit given by non-local effects in BOTDA sensors

Nonequilibrium exciton physics in hybrid lead-halide perovskites and anatase titanium dioxide

The strength of the electron-hole interaction in bulk semiconductors is not only determined by the dielectric environment, but also depends on the presence of other quasiparticles - free charge carriers or phonons - that populate the system. In the former ...

EPFL2019

Electric Charge Transfer Between Cascading Dielectric Electroactive Polymer Actuators

Yves Perriard, Alexis Boegli, Jonathan André Jean-Marie Chavanne, Raphaël Johannes Charles Mottet

With the never slowing interest in dielectric electroactive polymer (DEAP) actuators for medical applications, the need to optimize the management of the driving energy of these actuators becomes evermore important. In order to tackle the problematic of th ...

2018

Where Does Energy Go in Electron Energy Loss Spectroscopy of Nanostructures?

Jürgen Brugger, Olivier Martin, Valentin Flauraud, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Jérémy Butet

Electron energy loss spectroscopy is a method of choice for the characterization of both the spatial and spectral properties of localized surface plasmon resonances. The energy lost by the impinging electrons is commonly explained by the Lorentz force acti ...

2017

On Micro Optical Elements for Efficient Light Diffusion

Roland Andreas Bitterli

Efficient light management is one of the key issues in modern energy conversion systems, be it to collect optical power or to redistribute light generated by high power light emitters. This thesis touches mainly on the subject of efficient light redistribu ...

EPFL2013

Impact of pump depletion on the determination of the Brillouin gain frequency in distributed fiber sensors

Luc Thévenaz, Stella Foaleng Mafang, Jie Lin

The energy transfer between the two interacting optical waves in a distributed sensor based on stimulated Brillouin scattering can lead to a non-uniform spectral distribution of the pumping power after a long propagation. This results in a spectrally disto ...

SPIE2011

Coherence properties of microcavity polaritons : from parametric scattering to Bose-Einstein condensation

Stefan Kundermann

This thesis presents the coherence properties of polaritons in semiconductor microcavities. Semiconductor microcavities are microstructures in which the exciton ground state of a semiconductor quantum well is coupled to a photonic mode of a microresonator. ...

EPFL2006