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Your search keyword '"Haidar, Riad"' showing total 125 results
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125 results on '"Haidar, Riad"'

109. Versatile architecture of ultra-narrow band absorbing photonic nanostructure.

Author

Michinel, H., Costa, M.F., Frazao, O., Verlhac, Clément, El-Ouazzani, Hasnaa, Makhsiyan, Mathilde, Haidar, Riad, Primot, Jérôme, and Bouchon, Patrick

Subjects
NANOSTRUCTURES, OPTICAL properties, NANOPARTICLES, DIELECTRIC devices, WAVEGUIDES
Abstract

Ultra narrow-band absorbing surfaces answer a growing demand of precise control of absorption spectra. Starting from a design of guided mode resonator (GMR), we present here a versatile architecture presenting resonances of very high quality factors (up to 10 000) and spectrally adjustable. This design uses multiple slices of dielectrics to focus resonating field in the middle of a metallic waveguide, diminishing its extension in the metal and thus the loss rate of the propagating mode. [ABSTRACT FROM AUTHOR]

Published
2020
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113. Nonresonant quasi-phase matching in GaAs plates by Fresnel birefringence.

Author

Haidar, Riad, Kupecek, Ph., and Rosencher, E.

Subjects
*DOUBLE refraction, *FRESNEL lenses, *GALLIUM arsenide
Abstract

Quasi-phase matching is usually obtained by sign reversal of nonlinear susceptibility. This leads to resonant condition on nonlinear material dimensions and/or converted frequencies. We show that this condition is alleviated using total reflection birefringence. Indeed, Fresnel dephasing at reflection can compensate for almost any phase lag between interacting waves. This nonresonant phase-matching scenario allows both large tunability and nonlinear device design tolerance. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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114. Study Photonics - France

Author

Haidar, Riad

Subjects
University, Photonics, Master, Light, Bachelor, 4. Education, Physics, Study, PhD, directory, training courses, Optics, France
Abstract

The “Study Photonics!” brochure, aims at students containing information regarding where to study photonics in all the consortium’s partners countries. This is the edition of Study opportunities in France. The objective of this brochure is to promote photonics for future entrepreneurs, in order to make them want to study photonics and then create companies in this field. The brochure was distributed to students in high schools before they choose their specialization.

116. Study Photonics - Europe

Author

Dr. Adam, A.J.L., Bindig, Petra, Bondani, Maria, Chiappini, Andrea, Chorvat, Dusan, Haidar, Riad, John, Pearl, and Jefferson-Brain, Tom

Subjects
Europe, University, Photonics, Master, Light, Bachelor, 4. Education, Physics, Study, PhD, directory, training courses, Optics
Abstract

The “Study Photonics!” brochure, aims at students containing information regarding where to study photonics in all the consortium’s partners countries, e.g. Germany, Italy, UK or Slovakia. The objective of this brochure is to promote photonics for future entrepreneurs, in order to make them want to study photonics and then create companies in this field. The brochure was distributed to students in high schools before they choose their specialization.

124. Light Funneling Mechanism Explained by Magnetoelectric Interference.

Author

Pardo, Fabrice, Bouchon, Patrick, HaIdar, Riad, and Pe1ouard, Jean-Luc

Subjects
*ELECTROMAGNETIC fields, *SPINTRONICS, *PLASMA etching, *QUANTUM interference, *ELECTROMAGNETIC interference
Abstract

We investigate the mechanisms involved in the funneling of optical energy into subwavelength grooves etched on a metallic surface. The key phenomenon is unveiled thanks to the decomposition of the electromagnetic field into its propagative and evanescent parts. We unambiguously show that the funneling is not due to plasmonic waves flowing toward the grooves, but rather to the magnetoelectric interference of the incident wave with the evanescent field, this field being mainly due to the resonant wave escaping from the groove. [ABSTRACT FROM AUTHOR]

Published
2011
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125. Room-temperature electroluminescence in the mid-infrared (2-3 microm) from bulk chromium-doped ZnSe.

Author

Jaeck J, Haidar R, Rosencher E, Caes M, Tauvy M, Collin S, Bardou N, Luc Pelouard J, Pardo F, and Lemasson P

Abstract

Electroluminescence associated with impact excitation or ionization of deep Cr(2+) impurity centers in bulk ZnSe is reported. A broad signal of mid-infrared luminescence between 2 and 3 microm is observed once the biased bulk ZnSe device runs into a nonlinear conduction regime. Optical powers in the nanowatt range have been measured at room temperature. The different mechanisms involved in this intracenter infrared light emission are discussed.

Published
2006
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