Abstract: A device for detecting gamma radiation has an assembly of scintillating and light-guiding materials, producing scintillation light upon incidence of radiation. At least one photon-detector device includes a detection surface optically coupled to the assembly. The assembly includes at least one photonic crystal slab configured to direct said scintillation light towards the detection surface along an extraction direction. The extraction direction is substantially perpendicular to the detection surface. The photonic crystal slab is arranged substantially perpendicular to the detection surface.

Abstract: A correction device for correcting a radio frequency magnetic field in magnetic resonance imaging, the device intended to be positioned on an area of a patient's body during a magnetic resonance imaging examination and including a substrate and at least one conductor track on the substrate, the at least one conductor track having at least two segments that are connected to each other by at least one reactive electrical component.

Abstract: A system is described for emitting a radiofrequency field for a magnetic resonance imaging device, including a volumetric antenna that emits a radiofrequency field, a device for homogenizing the radiofrequency field arranged between said volume antenna and a part of the body to be imaged. The device may include a first continuous metal track with an overall length of approximately 0.5 to approximately 1.5 times said wavelength of the radio frequency field. The first metallic track may occupy a surface with a largest dimension ranging between approximately 5% and approximately 15% of said wavelength of the radio frequency field. The first metal track is arranged in a pattern including a plane of symmetry that is normal to the electrical component of the radio frequency field, so as to give the device an electric dipole property including a natural frequency strictly greater than the frequency of the radio frequency field.

Abstract: A seismic wave shield for protecting an area from seismic vibrations and a method of shielding an area from seismic waves by installing a seismic wave shield. The seismic wave shield comprises a set of columns embedded in regolith and in contact with bedrock. There is a material contrast between a material forming the columns and the regolith.

Abstract: A method for manufacturing an optical metasurface is configured to operate in a given working spectral band. The method comprises: obtaining a 2D array of patterns, each comprising one or more nanostructures forming dielectric elements that are resonant in said working spectral band, said nanostructures being formed in at least one photosensitive dielectric medium; exposing said 2D array to a writing electromagnetic wave having at least one wavelength in said photosensitivity spectral band, said writing wave having a spatial energy distribution in a plane of the 2D array that is a function of an intended phase profile, so that each pattern of the 2D array produces on an incident electromagnetic wave having a wavelength in the working spectral band, a phase variation corresponding to a refractive index variation experienced by said pattern during said exposure.

Abstract: This magnetic emission device includes an antenna and further includes a device configured to select one of a plurality of predefined portions of the antenna and to connect the selected portion to a current-generating device in order both to cause the current to pass through the selected portion of the antenna so as to radiate a magnetic field, and to prevent the current from passing outside of the selected portion of the antenna.

Abstract: This magnetic emission device includes an antenna and further includes means designed to select one of a plurality of predefined portions of the antenna and to connect the selected portion to a current-generating device in order both to cause the current to pass through the selected portion of the antenna so as to radiate a magnetic field, and to prevent the current from passing outside of the selected portion of the antenna.

Abstract: A seismic wave shield for protecting an area from seismic vibrations and a method of shielding an area from seismic waves by installing a seismic wave shield. The seismic wave shield comprises a set of columns embedded in regolith and in contact with bedrock. There is a material contrast between a material forming the columns and the regolith.