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Concept

Polarisabilité

Publications associées (30)

Cyanine platelet single crystals: growth, crystal structure and optical spectra

Frank Nüesch, Jakob Heier, Antonia Neels

Crystalline organic semiconducting materials are much in demand for multiple electronic and optoelectronic device applications. Here, solution grown ultrathin rhombic crystals of a trimethine carbocyanine anionic dye are used to establish relationships bet ...

Royal Society of Chemistry2018

Using Laser-Induced Rydberg Spectroscopy diagnostic for direct measurements of the local electric field in the edge region of NSTX/NSTX-U: Modeling

Luc Reymond

We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region of NSTX/NSTX-U. This laser based diagnostic's principle consists of depleting the naturally populated n = 3 level to a Rydberg state-sensitive to elec ...

2018

Impact of Local Electric Fields on Charge-Transfer Processes at the TiO2/Dye/Electrolyte Interface

Nikolaos Vlachopoulos

Photoinduced electron -transfer processes at the TiO2/ dye/electrolyte interface are vital for various emerging technologies. Here, the impact of the local electric field at this interface on the charge -transfer processes was investigated in two aspects: ...

Amer Chemical Soc2017

Origins of the macroscopic symmetry breaking in centrosymmetric phases of perovskite oxides

Sina Hashemi Zadeh

Many perovskite materials experience a temperature-driven phase transition at the Curie temperature from a non-centrosymmetric polar ferroelectric phase to a paraelectric phase, where polarization is lost. The paraelectric phase is usually centrosymmetric ...

EPFL2017

Charge generation by ultra-stretchable elastomeric electrets

Frank Nüesch, Yee Song Ko

Novel piezoelectric elastomers are synthesized and their long term stability and piezoelectric properties are investigated. They are thin film composites of specially designed polymer nanoparticles with high glass transition temperatures (T-g) and side gro ...

Royal Society of Chemistry2017

Poleable Dielectric Elastomer Composites

Yee Song Ko

As part of the recent efforts on renewable energies, energy harvesting by exploiting environmental motions and vibrations to generate electricity is being enthusiastically developed as a novel kind of green energy source. Piezoelectric materials are a logi ...

EPFL2017

Near optimal graphene terahertz non-reciprocal isolator

Juan Ramon Mosig, Mihai Adrian Ionescu, Julien Perruisseau-Carrier, Michele Tamagnone, Clara-Fausta Moldovan

Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important ope ...

Nature Publishing Group2016

Proton polarization above 70% by DNP using photo-excited triplet states, a first step towards a broadband neutron spin filter

Tim Rolf Eichhorn

The use of polarized protons as neutron spin filter is an attractive alternative to the well established neutron polarization techniques, as the large, spin-clepenclent neutron scattering cross-section for protons is useful up to the sub-MeV region. Employ ...

Elsevier2014

Upper bounds for flexoelectric coefficients in ferroelectrics

Alexander Tagantsev, Petr Yudin

Flexoelectric effect is the response of electric polarization to the mechanical strain gradient. At the nano-scale, where large strain gradients are expected, the flexoelectric effect becomes appreciable and may substitute piezoelectric effect in centrosym ...

American Institute of Physics2014

An impedance-based flow microcytometer for single cell morphology discrimination

Philippe Renaud, Ludovica Colella, Marjan Shaker

Cell shape is a fundamental biological feature, providing specific information about physiological or pathological cellular conditions. Most of the state-of-the-art microfluidic cytometers, however, only allow simple cell analysis, including viability stud ...

Royal Soc Chemistry2014