Abstract: An optical particle detector is configured to simultaneously detect at least two particles within a useful detection volume. The detector includes a retina capable of receiving light rays scattered by the particles and a dark reticle interposed between the useful detection volume and the retina. The dark reticle includes at least one optical aperture allowing a passage towards the retina of a part of first scattered light rays and of a part of second scattered light rays, and an opaque surface on a periphery of the at least one aperture, preventing a passage towards the retina of another part of the first and second scattered light rays so as to project onto the retina first and second scattering diagrams separated from each other.

Abstract: A sensor including an optical cavity capable of receiving the gas, and defined by first and second opposite ends and a connecting portion connecting said ends; a light source arranged to emit infrared light in the optical cavity; at least one infrared detector arranged to detect the infrared light; at least one mirror arranged in the optical cavity to guide the infrared light towards said at least one infrared detector; the sensor being remarkable in that it includes first and second reflective elements respectively extending at the first and second ends of the optical cavity, and having an infrared light reflection coefficient greater than or equal to 75% for any angle of incidence.

Abstract: A sensor including an optical cavity capable of receiving the gas, and defined by first and second opposite ends and a connecting portion connecting said ends; a light source arranged to emit infrared light in the optical cavity; at least one infrared detector arranged to detect the infrared light; at least one mirror arranged in the optical cavity to guide the infrared light towards said at least one infrared detector; the sensor being remarkable in that it includes first and second reflective elements respectively extending at the first and second ends of the optical cavity, and having an infrared light reflection coefficient greater than or equal to 75% for any angle of incidence.

Abstract: A gas detector including: an assembly of two coaxial parabolic reflective caps having opposite concavities, and a wafer arranged in the focal plane of the two caps, at the center of this focal plane, comprising, back-to-back: a diverging light emitter directed towards the first cap and a light receiver directed towards the second cap, wherein the two caps are distant substantially by the sum of their focal distances plus the thickness of the wafer.

Abstract: A gas detector including: an assembly of two coaxial parabolic reflective caps having opposite concavities, and a wafer arranged in the focal plane of the two caps, at the center of this focal plane, comprising, back-to-back: a diverging light emitter directed towards the first cap and a light receiver directed towards the second cap, wherein the two caps are distant substantially by the sum of their focal distances plus the thickness of the wafer.

Abstract: The invention relates to a plasmon resonance optical detection device including a stack of layers comprising: a metal layer based on a noble metal that will generate said plasmon, a layer of dielectric material, at least one first semiconductor bond layer placed between said metal layer and said dielectric layer, said semiconductor layer covering a face of the metal layer.

Abstract: The invention concerns a device for enhancing fluorescence comprising a support (10) carrying fluorescence enhancement means (11), the fluorescence enhancement means offering a reception surface for chemical or biological elements intended to be read by detection of a fluorescence signal emitted by a fluorophore, associated with the chemical or biological elements, under the effect of an excitation light beam. The fluorescence enhancement means (11) is made up of a thin, transparent, dielectric layer or a stack of thin, transparent, dielectric layers (12 to 16) ensuring a mirror function for the fluorescence signal and excitation light beam, the material of the thin layer or of each thin layer of the stack being chosen from among the following materials: TiO2, Ta2O5, HfO2, ZrO2, MgO, SiO2, Si3N4, MgF2 and YF3. The fluorescence enhancement device may be used for a biological or chemical optic sensor.

Abstract: The invention relates to a plasmon resonance optical detection device including a stack of layers comprising: a metal layer based on a noble metal that will generate said plasmon, a layer of dielectric material, at least one first semiconductor bond layer placed between said metal layer and said dielectric layer, said semiconductor layer covering a face of the metal layer.

Abstract: The invention concerns a device for enhancing fluorescence comprising a support (10) carrying fluorescence enhancement means (11), the fluorescence enhancement means offering a reception surface for chemical or biological elements intended to be read by detection of a fluorescence signal emitted by a fluorophore, associated with the chemical or biological elements, under the effect of an excitation light beam. The fluorescence enhancement means (11) is made up of a thin, transparent, dielectric layer or a stack of thin, transparent, dielectric layers (12 to 16) ensuring a mirror function for the fluorescence signal and excitation light beam, the material of the thin layer or of each thin layer of the stack being chosen from among the following materials: TiO2, Ta2O5, HfO2, ZrO2, MgO, SiO2, Si3N4, MgF2 and YF3.

Abstract: The invention concerns a solid support (1) having a surface (4) for immobilizing oligonucleotides, characterized in that said surface (4) is the surface of a material (3) chosen from among HfO2, TiO2, Ta2O5, ZrO2 and a mixture comprising at least one of these materials, said surface (4) having undergone a treatment to make it hydrophilic.