Concept

Diélectrique

Publications associées (876)

Direct Comparison of Multi-photon and EUV Single-Photon Probing of Molecular Relaxation Processes

We present a new setup for time-resolved photoelectron and photoion spectroscopy allowing for single-photon EUV or multi-photon NIR ionization. Comparison of the two different probe schemes reveals disagreements shedding light on the underlying advantages ...

Springer-Verlag Berlin2015

Phase transitions associated with competing order parameters in compressively strained SrTiO3 thin films

Alexander Tagantsev, Harry Joseph Trodahl

(100)-epitaxial SrTiO3 thin films having biaxial compressive strains up to -1.60% were grown on lattice mismatched substrates. Two phase transitions induced by the coupled instabilities (antiferrodistortive and ferroelectric) in SrTiO3 were revealed in a c ...

Amer Physical Soc2015

Self-biased reconfigurable graphene stacks for terahertz plasmonics

Mihai Adrian Ionescu, Arnaud Magrez, Clara-Fausta Moldovan, Julien Perruisseau-Carrier, Santiago Capdevila Cascante, Laurent Syavoch Bernard

The gate-controllable complex conductivity of graphene offers unprecedented opportunities for reconfigurable plasmonics at terahertz and mid-infrared frequencies. However, the requirement of a gating electrode close to graphene and the single 'control knob ...

Nature Publishing Group2015

Adaptive Millimeter-Wave and THz Antenna Devices Based on Dielectric Elastomer Actuators

Pietro Romano

Dynamic reconfiguration of antenna devices is becoming a prime need in emerging telecommunication and remote sensing systems operating in the portion of the electromagnetic (EM) spectrum spanning from millimeter-wave (MMW) to terahertz. Different technique ...

EPFL2015

Grain boundary relaxation in yellow gold bi-crystals

Daniele Mari, Robert Schaller, Iva Tkalcec Vâju

The mechanical loss spectrum of a yellow gold bi-crystal is presented and analyzed in detail. The relaxation strength is monitored as a function of several geometrical parameters such as sample width, length and thickness. It is found that the relaxation s ...

Elsevier2015

Effective-surface-energy approach for size effects in ferroics

Nava Setter, Alexander Tagantsev, Jin Wang

We present a simple approach enabling analytical treatments of size effects in ferroelectric samples of complicated shapes for the cases where long-range depolarizing effects are not involved. The key element of the approach is the presentation of the ener ...

American Physical Society2015

Construction of a 4 GHz resonant cavity operating in TE011 mode: Simulation and Experiments

Tarek Axel Vennemann

During this project we studied cavities as an alternative method to stripline resonators, to create an oscillating magnetic field. We were able to simulate different cavity designs and reproduce theoretical results as a numerical simulation and experimenta ...

2015

Air-suspended TiO2-based HCG reflectors for visible spectral range

Georg Rossbach, Ehsan Hashemi

For GaN-based microcavity light emitters, such as vertical-cavity surface-emitting lasers (VCSELs) and resonantcavity light emitting diodes (RCLEDs) in the blue-green wavelength regime, achieving a high reflectivity wide bandwidth feedback mirror is truly ...

Spie-Int Soc Optical Engineering2015

Converse mode piezoelectric coefficient for lead zirconate titanate thin film with interdigitated electrode

Paul Muralt, Ramin Matloub Aghdam, Robin Nigon, Silviu Cosmin Sandu, Andrea Mazzalai, Nachiappan Chidambaram, Davide Balma

The use of interdigitated electrodes (IDEs) in conjunction with ferroelectric thin films shows many attractive features for piezoelectric MEMS applications. In this work, growth of {1 0 0}-textured lead zirconate titanate (PZT) thin films was achieved on i ...

Institute of Physics2015

Wideband, low profile and circularly polarized K/Ka band antenna

Juan Ramon Mosig, Joana Rita Alves dos Santos Silva, Przemyslaw Andrzej Gorski

This paper presents a wideband circularly polarized planar antenna element for both K and Ka bands. The proposed solution is composed by several thin layers of dielectric substrate that allocate two circular stacked patches, a crossed-slot and two fork-sha ...

2015

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