Concept

Reflection coefficient

Related publications (106)

Design of Acoustic Metamaterials based on the Concept of Dual Transmission Line

Hervé Lissek, Frédéric Bongard, Anne-Sophie Moreau

Within the last years, an increasing number of studies have been carried out in the field of acoustic metamaterials. These artificial composite materials aim at achieving new macroscopic properties, like negative refraction, that are not readily present in ...

2010

Unit cells for dual-polarized and polarization-flexible reflectarrays with scanning capabilities

Julien Perruisseau-Carrier

We present the analysis and design of reflecting cells capable of dynamically and independently control the reflection phase of each component of a dual-polarized impinging wave. Such capability is of significant interest for the future implementation of d ...

2009

Fabry-Perot Resonances in One-Dimensional Plasmonic Nanostructures

Klaus Kern, Ralf Thomas Weitz

We study the near-field optical behavior of Fabry-Perot resonances in thin metal nanowires, also referred to as quasi one-dimensional plasmonic nanoantennas. From eigenmodes well beyond quadrupolar order we extract both, propagation constant and reflection ...

2009

Development of an RTU for synchrophasors estimation in active distribution networks

Mario Paolone

The centralized control of active distribution networks with large penetration of dispersed resources requires algorithms capable of providing network state estimation. Within this context, the measurement of bus voltage synchrophasors provides useful data ...

2009

Effect of an abdominal aortic aneurysm on wave reflection in the aorta

Nikolaos Stergiopoulos, Patrick Segers

Despite extensive attention to abdominal aortic aneurysm (AAA) in the biomedical engineering community, its effect on aortic hemodynamics and arterial wave reflection has not been addressed before. We used experimental and numerical methods, relying on a r ...

2008

Monolithic MEMS-based reflectarray cell digitally reconfigurable over a 360° phase range

Anja Skrivervik, Julien Perruisseau-Carrier

In this letter, we present a reconfigurable reflectarray cell operating at 12 GHz and fabricated in a monolithic MEMS process. A 5-bit digital control allows reconfiguration of the reflection phase over the full 360deg range, while alleviating the impact o ...

Institute of Electrical and Electronics Engineers2008

Microlenses on Bragg Reflectors to Create Iridescent Colors

Hans Peter Herzig, Toralf Scharf

In nature strong colors play an important role in scaring away predators or finding a mate. Often, the strongest and brightest colors arise from coherent scattering and reflection on periodic structures on a length scale of several micro- or nanometers. Un ...

2008

Exploring light propagating in photonic crystals with Fourier optics

Romuald Houdré, Nicolas Le Thomas

Photonic crystals (PhCs) act on light in two different ways: confinement and modification of propagation. Both phenomena rely on the complex interplay between multiply scattered waves that can form what is known as a Bloch mode. Here, we present a techniqu ...

Optical Society of America2007

Digital holographic microscopy for nanometric quality control of micro- optical components

Christian Depeursinge, Tristan Colomb, Etienne Cuche, Jonas Kühn, Florian Charrière

In this paper, Digital Holographic Microscopy (DHM) is presented as a powerful tool for quality control of micro-optical components. It will be shown that not only the single-shot full field-of-view nanometer axial resolution makes DHM an ideal solution fo ...

SPIE2007

Determination of Lightning Currents from Far Electromagnetic Fields: Effect of a Strike Object

Mario Paolone, Marcos Rubinstein, Davide Pavanello, José-Luis Bermudez

We discuss in this paper the influence of the presence of an elevated strike object on the peak of the lightning return stroke current determined from remote field measurements. We develop analytical expressions relating the lightning return stroke channel ...

2007

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