Concept

Dispersion (mécanique ondulatoire)

Publications associées (446)

Highly Sensitive Dispersion Map Extraction from Highly Nonlinear Fibers Using BOTDA Probing of Parametric Amplification

Luc Thévenaz, Camille Sophie Brès, Marcelo Alfonso Soto Hernandez, Fatemeh Alishahi, Andrey Denisov

Using an enhanced scheme for probing the distribution of parametric processes along fibers, a rapid and simple technique to map zero dispersion wavelength fluctuations of less than 0.02 nm with 2 meters resolution is demonstrated. ...

2013

Direct observation of non-fully-symmetric coherent optical phonons by femtosecond x-ray diffraction

Paul Beaud

We directly measure by femtosecond time-resolved x-ray diffraction the E-g symmetry coherent phonon excited in bismuth by a strong optical pulse. The magnitude of the E-g mode observed is 0.2 pm peak-to-peak, compared against the 2.7-pm initial displacemen ...

American Physical Society2013

Magnonic band structures in two-dimensional bi-component magnonic crystals with in-plane magnetization

Dirk Grundler

We investigate the magnonic band structure of in-plane magnetized two-dimensional magnonic crystals composed of cobalt dots embedded into a permalloy antidot lattice. Our analysis is based on the results of numerical calculations carried out by the plane w ...

2013

Effect of spatial dispersion on surface waves propagating along graphene sheets

Juan Ramon Mosig, Julien Perruisseau-Carrier, Juan Sebastian Gomez Diaz

We investigate the propagation of surface waves along a spatially dispersive graphene sheet, including substrate effects. The proposed analysis derives the admittances of an equivalent circuit of graphene able to handle spatial dispersion, using a non-loca ...

Institute of Electrical and Electronics Engineers2013

Surface Plasmons on Graphene Sheets: Effect of Spatial Dispersion and Magnetostatic Bias

Juan Ramon Mosig, Julien Perruisseau-Carrier

We study the characteristics of surface plasmons propagating along graphene sheets, focusing on the effect of spatial dispersion and applied magnetostatic bias, and taking into account the influence of the surrounding media, applied electrostatic biasing f ...

Ieee2013

Self-tracking solar concentrator

Christophe Moser, Eric Tremblay

A system for capturing solar light of the sun, whereby the solar light comprises a short wavelength light component and a long wavelength light component. The system comprises at least a lens (101), a light- guide (102), and a self-adaptive coupling featur ...

2013

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914

Frédéric Courbin, Georges Meylan, Malte Tewes

Aims. Within the framework of the COSMOGRAIL collaboration we present 7- and 8.5-year-long light curves and time-delay estimates for two gravitationally lensed quasars: SDSS J1206+4332 and HS 2209+1914. Methods. We monitored these doubly lensed quasars in ...

Edp Sciences S A2013

Extraordinary Sound Transmission through Density-Near-Zero Ultranarrow Channels

Romain Christophe Rémy Fleury

We introduce the acoustic equivalent of “supercoupling” by studying the anomalous sound transmission and uniform energy squeezing through ultranarrow acoustic channels filled with zero-density metamaterials. As a realistic example, we propose their realiza ...

American Physical Society2013

Magnonic crystal wave guide with large spin-wave propagation velocity in CoFeB

Dirk Grundler

Propagating spin-wave spectroscopy is reported for two-dimensional CoFeB antidot lattices (ADLs) with perpendicular-to-plane magnetization. The magnonic crystals consist of square lattices of 190 nm diameter holes with different periods p. At p = 600 nm, t ...

American Institute of Physics2013

Slowing, advancing and switching of microwave signals using circuit nanoelectromechanics

Tobias Kippenberg, Xiaoqing Zhou, Albert Schliesser

The parametric coupling of electromagnetic and mechanical degrees of freedom gives rise to a host of optomechanical phenomena. Examples include quantum-limited displacement measurements, sideband cooling or amplification of mechanical motion. Likewise, thi ...

Nature Publishing Group2013

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