Abstract: A method for controlling the distribution of the RF magnetic field in a magnetic resonance imaging system, having steps of: placing a cage coil in a permanent magnet supplying a permanent magnetic field along a first axis, and supplying an RF signal to the cage coil in order for the coil to generate an RF magnetic field rotating in a plane that runs perpendicular to the first axis; and putting in place an electromagnetic resonator, the resonance mode of which is excited by the rotating magnetic field, the resonator being placed in a position inside or outside the cage coil and at a distance from a region to be analyzed of an object to be placed in the cage coil, the resonance mode and the position of the resonator in relation to the volumetric antenna being suitable for adjusting the intensity of the rotating magnetic field in an area of the region to be analyzed.

Abstract: In the field of photonic and opto-electronic components, an optical filter comprises a plurality of semi-conducting nano-/microparticles, exhibiting properties of electromagnetic resonance in the optical and near-infrared domain, arranged on a plane, characterized in that it furthermore comprises a layer with electrically adjustable optical index disposed on the surface formed by said nano-/microparticles and said plane; a first electrically insulating layer disposed on said layer with electrically adjustable optical index and an electrode disposed on said first electrically insulating layer.

Abstract: A method for controlling the distribution of the RF magnetic field in a magnetic resonance imaging system, having steps of: placing a cage coil in a permanent magnet supplying a permanent magnetic field along a first axis, and supplying an RF signal to the cage coil in order for the coil to generate an RF magnetic field rotating in a plane that runs perpendicular to the first axis; and putting in place an electromagnetic resonator, the resonance mode of which is excited by the rotating magnetic field, the resonator being placed in a position inside or outside the cage coil and at a distance from a region to be analyzed of an object to be placed in the cage coil, the resonance mode and the position of the resonator in relation to the volumetric antenna being suitable for adjusting the intensity of the rotating magnetic field in an area of the region to be analyzed.

Abstract: In the field of photonic and opto-electronic components, an optical filter comprises a plurality of semi-conducting nano-/microparticles, exhibiting properties of electromagnetic resonance in the optical and near-infrared domain, arranged on a plane, characterized in that it furthermore comprises a layer with electrically adjustable optical index disposed on the surface formed by said nano-/microparticles and said plane; a first electrically insulating layer disposed on said layer with electrically adjustable optical index and an electrode disposed on said first electrically insulating layer.

Abstract: The present invention relates to an optical device for reflective diffraction with high diffraction efficiency and high laser flux resistance. The device includes a protective structure having at least one mixture layer produced by a uniform mixture of a first material and of a second material, where both of these are dielectric, and wherein said first material has an optical index lower than that of the said second material.

Abstract: A dispersive optical device with a three-dimensional photonic crystal. The object is to obtain a device having a high damage threshold on the whole and the making of which is facilitated and guaranteeing optimum optical properties. This object is achieved by using a device in silica including a three-dimensional photonic crystal and a diffraction grating. This device may notably be used in a compressor system for a short pulse.

Abstract: The present invention relates to an optical device for reflective diffraction with high diffraction efficiency and high laser flux resistance. The device includes a protective structure having at least one mixture layer produced by a uniform mixture of a first material and of a second material, where both of these are dielectric, and wherein said first material has an optical index lower than that of the said second material.

Abstract: A method for producing a reflective diffraction grating. The diffraction grating includes a stack of at least four dielectric material layers, and an upper dielectric material layer that is etched to form grooves of the diffraction grating having a predetermined pitch, The diffraction grating is produced by selecting the number and the nature of the dielectric material layers, digitally computing the reflection and/or transmission efficiencies of at least one of the orders of diffraction of the diffraction grating for a sample of frequencies of the spectral range of use for each of several predetermined diffraction grating configurations while varying the thicknesses of the at least four layers and at least one of the etching parameters of the upper layer, and selecting, from among the computed configurations, at least one configuration depending on the use of the grating.

Abstract: The invention relates to a dispersive optical device with a three-dimensional photonic crystal. The object of the invention is to obtain a device having a high damage threshold on the whole and the making of which is facilitated and guaranteeing optimum optical properties. This object is achieved by using a device in silica comprising a three-dimensional photonic crystal and a diffraction grating. This device may notably be used in a compressor system for a short pulse.