Concept

Série de Fourier

Publications associées (376)

Parallel architecture for high-speed analog-to-digital conversion

Nowadays digital signal processing systems used for radar applications, communication systems or RF measurement equipments, require very high sample-rates. Sometimes these sample-rates are beyond the possibilities offered by conventional ADCs. To overcome ...

EPFL2009

Fourier space imaging of light localization at a photonic band-edge located below the light cone

Romuald Houdré, Nicolas Le Thomas

We observe light localization in a two-dimensional geometry, induced by residual disorder at a photonic band edge located below the light cone. The combination of a spectrally selective illumination and a grating assisted k-space imaging technique allows u ...

2009

Fourier space imaging of light localization at a photonic band-edge located below the light cone

Romuald Houdré, Nicolas Le Thomas

2009

Piecewise polynomial phase approximation approach for the analysis of reconstructed interference felds in digital holographic interferometry

Pramod Rastogi, Sai Siva Gorthi

This paper proposes a new approach for the analysis of reconstructed interference fields in digital holographic interferometry. In the proposed approach the interference phase to be estimated is conceived as a piecewise polynomial signal; consequently, eac ...

Institute of Physics2009

Colloidal semiconductor/magnetic heterostructures based on iron-oxide-functionalized brookite TiO2 nanorods

Raffaella Buonsanti

A flexible colloidal seeded-growth strategy was developed to synthesize all-oxide semiconductor/magnetic hybrid nanocrystals (HNCs) in various topol. arrangements, for which the dimensions of the constituent material domains can be controlled independently ...

2009

Compensating Printer Modulation Transfer Function in Spatial and Color Adaptive Rendering Workflows

Albrecht Johannes Lindner

Experiments have shown that the quality of printed images depends on the capacity of the printing system to accurately re- produce details. We propose to improve the quality by compensat- ing for the Modulation Transfer Function (MTF) of the printing syste ...

2008

Coupling length of silicon-on-insulator directional couplers probed by Fourier-space imaging

Romuald Houdré, Nicolas Le Thomas, Jana Jágerská

We use a Fourier-space imaging technique relying on outcoupling grating probes to study the coupled mode interaction and dispersion properties of guided modes in silicon-on-insulator codirectional couplers. Our approach allows us to measure the mode splitt ...

American Institute of Physics2008

Analytical Solution for Rotor Eddy-Current Losses in a Slotless Permanent-Magnet Motor: The Case of Current Sheet Excitation

Yves Perriard, Miroslav Markovic

We present an analytical solution for the magnetic field, induced eddy currents, and the corresponding losses generated in the rotor of a slotless permanent-magnet (PM) motor. The field excitation is a current sheet placed at the stator interior surface. T ...

2008

Extended focus optical coherence microscopy and fluorescence lifetime imaging

Theo Lasser, Rainer Leitgeb, Martin Villiger, Adrian Bachmann, Cédric Blatter

Fourier domain Optical coherence microscopy (FDOCM) offers excellent sensitivity and high axial resolution to image the structure of biological tissue. The depth information is extracted in parallel and allows very high volume acquisition rates. The presen ...

SPIE2008

Study of the solar anisotropy of cosmic ray primaries of about 200 GeV energy with the L3+C muon detector

Qian Wang, Aurelio Bay, Horst Vogel, Eduardo Sanchez, Zhirui Xu, Werner Lustermann, Liang Sun, Jian Zhao, Yu Lei, Ji Hyun Kim, Zheng Wang, Matthias Weber, Xiao Wang, Yifei Guo, Xuan Yang

Context. Primary cosmic rays experience multiple deflections in the non-uniform galactic and heliospheric magnetic fields which may generate anisotropies. Aims. A study of anisotropies in the energy range between 100 and 500 GeV is performed. This energy r ...

2008

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