Concept

Diffusion dynamique de la lumière

Publications associées (210)

Resonances and absorption enhancement in thin film silicon solar cells with periodic interface texture

Christophe Ballif, Franz-Josef Haug, Karin Söderström, Ali Naqavi

We study absorption enhancement by light scattering at periodically textured interfaces in thin film silicon solar cells. We show that the periodicity establishes resonant coupling to propagating waveguide modes. Ideally, such modes propagate in the high i ...

American Institute of Physics2011

The Gigatracker: An ultra-fast and low-mass silicon pixel detector for the NA62 experiment

Alessandro Mapelli

The Gigatracker is a hybrid silicon pixel detector developed to track the highly intense NA62 hadron beam with a time resolution of 150 ps (rms). The beam spectrometer of the experiment is composed of three Gigatracker stations installed in vacuum in order ...

2011

Excitation of guided-mode resonances in thin film silicon solar cells

Christophe Ballif, Franz-Josef Haug, Karin Söderström, Ali Naqavi

Thin film silicon solar cells are attractive for photovoltaics; however, the poor charge transport in this material requires that the devices are thinner than the absorption length. Adequate absorption can nevertheless be achieved by light scattering at te ...

2011

Application of an asymmetric flow field flow fractionation (AF4) multi-detector approach for metallic ENP characterization - prospects and limitations demonstrated on Au nanoparticles

Christian Ludwig, Andrea Ulrich, Harald Hagendorfer

In this work we discuss about the method development, applicability and limitations of an asymmetric flow field flow fractionation (A4F) system in combination with a multi-detector setup consisting of UV/vis, light scattering, and inductively coupled plasm ...

Elsevier2011

Rods of Neutron Scattering Intensity in Yb2Ti2O7: Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide

Henrik Moodysson Rønnow

Paramagnetic correlations in the magnetic material Yb2Ti2O7 have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb3+ ions composed of all symmetry-allowed nearest neighbor exchange ...

American Physical Society2011

Photocurrent enhancement in thin film amorphous silicon solar cells with silver nanoparticles

Franz-Josef Haug, Xavier Niquille

Silver nanoparticles embedded in a dielectric material have strong scattering properties under light illumination, due to localized surface plasmons. This effect is a potential way to achieve light trapping in thin-film solar cells. In this paper we study ...

Wiley-Blackwell2011

New Analytical Methods for Size Fractionated, Quantitative, and Element Specific Analysis of Metallic Engineered Nanoparticles in Aerosols and Dispersions

Harald Hagendorfer

The application of engineered nanoparticles (ENP) increased almost exponentially during the last decade. Next to carbon based ENP, metal based ENP are the next most commonly employed. Utilization of such particles for medical applications, remediation of t ...

EPFL2011

Beyond the lateral resolution limit by phase imaging

Christian Depeursinge, Muhammed Fatih Toy, Yann Jérôme Michel Pascal Cotte

We present a theory to extend the classical Abbe resolution limit by introducing a spatially varying phase into the illumination beam of a phase imaging system. It allows measuring lateral and axial distance differences between point sources to a higher ac ...

2011

Direct observation of the full transition from ballistic to diffusive Brownian motion in a liquid

Sylvia Jeney, Branimir Lukic

At timescales once deemed immeasurably small by Einstein, the random movement of Brownian particles in a liquid is expected to be replaced by ballistic motion. So far, an experimental verification of this prediction has been out of reach due to a lack of i ...

2011

Distance-controlled scattering in a plasmonic trap

Olivier Martin, Lina Huang

Light scattered by a dielectric object when it is trapped in the field of a plasmonic nanostructure is studied theoretically and experimentally using both dielectric spheres and S. cerevisiae cells. A dramatic enhancement of the scattered light is observed ...

2010

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