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Publications associées (207)

Mechanically tuneable microoptical structure based on PDMS

Jürgen Brugger, Luis Guillermo Villanueva Torrijo, Victor Javier Cadarso Busto

A PDMS based tuneable microoptical system fabricated merging deep reactive ion etching, SU-8 and soft lithography, with a low-cost (mass-production), simple and highly repetitive technology, is presented. This system consists on a structure of two microlen ...

2009

Preservation of heteronuclear multiple-quantum coherences in NMR by double-resonance irradiation

Geoffrey Bodenhausen, Mariachiara Verde, Simone Ulzega, Fabien Ferrage

A heteronuclear double-resonance (HDR) method based on MLEV-32 or WALTZ-32 pulse sequences has been designed for the investigation of relaxation of heteronuclear multiple-quantum (MQ) coherences. The theoretical analysis of this technique uses average Hami ...

2009

Distributed Sensing of Signals Linked by Sparse Filtering

Martin Vetterli, Olivier Roy, Yue Lu, Ali Hormati

We consider the task of recovering correlated vectors at a central decoder based on fixed linear measurements obtained by distributed sensors. A general formulation of the problem is proposed, under both a universal and an almost sure reconstruction requir ...

2009

Ultrafast Structural Phase Transition Driven by Photoinduced Melting of Charge and Orbital Order

Paul Beaud

We use femtosecond x-ray diffraction to probe directly the structural dynamics of a charge ordered and orbitally ordered thin film of La0.42Ca0.58MnO3 initiated by an ultrafast optical pulse. At low excitation fluences we observe the displacive excitation ...

American Physical Society2009

Fusion and Confusion

Jérôme Chenal, Martin Schuler

This publication compiles the results of the SpaceWatch event 2008. The first edition has taken place in Lausanne on May 15th, 2008. The present book is composed of two parts. Part I presents the scientific comments on the press review highlighting the con ...

Spacewatch2008

Second-order time correlations within a polariton Bose-Einstein condensate in a CdTe microcavity

Benoît Marie Joseph Deveaud

Second-order time correlations of polaritons have been measured across the condensation threshold in a CdTe microcavity. The onset of Bose-Einstein condensation is marked by the disappearance of photon bunching, demonstrating the transition from a thermal- ...

American Physical Society2008

Room temperature polariton lasing in a GaN/AlGaN multiple quantum well microcavity

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Eric Feltin, Gabriel Christmann

The authors report room temperature polariton lasing at lambda similar to 345 nm in a hybrid AlInN/AlGaN multiple quantum well microcavity (MQW-MC) containing a GaN/AlGaN MQW active region, i.e., the achievement under nonresonant optical excitation of cohe ...

2008

Irreversible evolution of many-electron systems: From the quantum-Boltzmann equation toward the semi-classical Boltzmann equation

Starting from the quantum-Boltzmann equation derived in a previous paper, we study the irreversible evolution of an electron gas in the one-particle phase space. The connection with phase space is established by expressing one-electron states in terms of t ...

2008

Optical pulse coding applied to distributed temperature sensor using coherent detection of spontaneous Brillouin frequency shift

A 53-km Simplex-coded distributed temperature sensor based on coherent detection of Brillouin frequency shift is demonstrated with 1.1 K and 35 m resolutions, using only 10 mW input peak power. ...

IEEE2008

The Political Praille Project (Geneva)

Jérôme Chenal

Spacewatch2008

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