Abstract: A gas detector including a planar mirror; a concave spherical mirror facing the planar mirror, having an optical axis orthogonal to the planar mirror, the distance between the planar and spherical being equal to 0.75 times the radius of curvature of the spherical mirror, to within 10%; a radiation emitter/receiver arranged at the point of intersection of the spherical mirror and of the optical axis; and a radiation receiver/emitter arranged at the point of intersection of the planar mirror and of the optical axis.

Abstract: The invention relates to a particle detector including a substrate made of a semiconductor material, in which at least one through-cavity is formed, defined by an input section and an output section, wherein the input section thereof is to be connected to an airflow source, the substrate supporting: an optical means including at least one laser source, and at least one waveguide connected to the at least one laser source and leading into the vicinity of the output section of the cavity; and a photodetector located near the output section of the cavity and offset relative to the optical axis of the optical means.

Abstract: A heating mold for thermal nanoimprint lithography is disclosed. According to one aspect, the mold includes a resistive heating element and collecting element for collecting the electromagnetic energy of a variable electromagnetic field emitted by a source located outside the mold. The collecting element being connected to the resistive heating element in which the electromagnetic energy is dissipated. A method for manufacturing the mold, a thermal nanoimprint lithography device including the mold, and a a method for preparing a substrate including a surface nanostructured by a thermal nanoimprint lithography technique using the mold is applied are also disclosed.

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 device for non-linear conversion of first infrared signal into a second infrared signal with a wavelength that is less than that of the first infrared signal by means of four-wave mixing, which includes at least one portion of SiGe arranged on at least one first layer of material with a refractive index which is less than that of silicon, a germanium concentration in the portion of SiGe which varies continuously between a first value and a second value which is greater than the first value, in a direction which is approximately perpendicular to a face of the first layer on which the portion of SiGe is arranged, and in which a summital part of the portion of SiGe where the germanium concentration is equal to the second value is in contact with a gas and/or a material with a refractive index which is less than that of the silicon.

Abstract: A heating mould for thermal nanoimprint lithography, a process of producing the heating mould, and a process for producing a nanostructured substrate which include the heating mould. The heating mould includes the heating mould. The heating mould includes a substrate having a first principal surface and a second principal surface, and a through-cavity extending from a first orifice in the first principal surface up to a second orifice in the second principal surface. The mould also includes a heating layer, an electrically and thermally insulating layer which covers the heating layer and, at least partially, imprint patterns, and leads for supplying an electric current to the heating layer.

Abstract: The invention relates to a particle detector including a substrate (10, 30, 40) made of a semiconductor material, in which at least one through-cavity (11, 31, 41) is formed, defined by an input section (110) and an output section (111), wherein the input section thereof is to be connected to an airflow source, said substrate supporting: an optical means including at least one laser source (12, 32, 42), and at least one waveguide (13, 33, 43) connected to said at least one laser source and leading into the vicinity of the output section of said cavity; and photodetector means (14, 34, 44) located near the output section of said cavity and offset relative to the optical axis of the optical means.

Abstract: Device for detecting a gas having an excitation device for exciting the gas by an electromagnetic wave having a wavelength corresponding approximately to that of the gas; and a detection device for detecting the excitation of the gas, the detection device having a waveguide connected to the excitation device, a part of which forms a movable element designed to be in contact with the gas and capable of being set into vibration by the impact of the excited gas molecules; and a measurement sensor, for measuring the vibration of the element, the measurement sensor and the element forming the detection device.

Abstract: Methods are provided which comprise the steps of: a) emitting through the cutting head of the laser cutting machine a focused laser beam that does not cut or etch the material of the tube; b) moving the cutting head along a given scanning direction; and c) while the cutting head is moving along the scanning direction, detecting through suitable sensors the radiation reflected or emitted by the tube and establishing point by point, on the base of the signal provided by these sensors, the presence or absence of the material of the tube.

Abstract: The invention relates to a spectroscopic detector, including: at least one waveguide (70) arranged on a substrate (7) and having an input surface (700) to be connected to an electromagnetic source, in particular an infrared source, and a mirror (701) on the opposite surface, so as to generate a standing wave inside the waveguide; and a means for detecting electromagnetic radiation, which output an electrical signal according to the local intensity of the electromagnetic wave, characterised in that said detection means consists of suspended membrane bolometers (72 to 75) distributed between the input surface and the mirror, each membrane of said heat detectors being separated from said at least one waveguide by anchoring points (42) on said substrate (7), and in that means (702 to 705) for sampling a portion of the electromagnetic wave is provided between the input surface and the mirror.

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 photoacoustic detection device including a nanophotonic circuit including a first chip on which is formed at least one optical waveguide and in which is formed a set of cavities defining a Helmholtz resonator; at least one optical source capable of emitting an optical signal in a given wavelength range, capable of being modulated at an acoustic modulation frequency, this source being attached to the first chip; a second chip forming a cap for said cavities and including acoustic sensors; and electronic circuits for processing the output of the acoustic sensors formed in the first or the second chip. Further, an optical waveguide comprising, on a silicon substrate, a silicon germanium core with a variable germanium concentration along a direction perpendicular to the substrate, said core being covered with a cladding silicon layer.

Abstract: The invention relates to a particle detector including a substrate (10, 30, 40) made of a semiconductor material, in which at least one through-cavity (11, 31, 41) is formed, defined by an input section (110) and an output section (111), wherein the input section thereof is to be connected to an airflow source, said substrate supporting: an optical means including at least one laser source (12, 32, 42), and at least one waveguide (13, 33, 43) connected to said at least one laser source and leading into the vicinity of the output section of said cavity; and photodetector means (14, 34, 44) located near the output section of said cavity and offset relative to the optical axis of the optical means.

Abstract: A 3D imaging device is comprised of a photodetector matrix, a layer of material fixed on a face of the photodetector matrix, the layer of material being capable of absorbing or reflecting light, an opening being formed in said layer of material at each photodetector, a layer of insulating material fixed on said layer of material capable of reflecting or absorbing light, the layer of insulating material having a face surrounding, in the body thereof, a set of G waveguides, each waveguide of the set of waveguides being positioned vertically in relation to said face, opposite an opening, the heights of the different waveguides, considered in relation to the face of the layer of insulating material, defining N distinct levels, N being a whole number greater than or equal to 2.

Abstract: A photoacoustic detection device including a nanophotonic circuit including a plurality of semiconductor lasers capable of emitting a different frequencies; input couplers connected to optical waveguides; a multiplexer; an output optical waveguide, emerging into a recess; a tuning fork having its free arms arranged at the output of the output optical waveguide; and means for detecting the vibration of the tuning fork, all these elements being assembled in a monolithic component.

Abstract: A photoacoustic detection device including a nanophotonic circuit including a first chip on which is formed at least one optical waveguide and in which is formed a set of cavities defining a Helmholtz resonator; at least one optical source capable of emitting an optical signal in a given wavelength range, capable of being modulated at an acoustic modulation frequency, this source being attached to the first chip; a second chip forming a cap for said cavities and including acoustic sensors; and electronic circuits for processing the output of the acoustic sensors formed in the first or the second chip.

Abstract: A heating mold for thermal nanoimprint lithography comprising resistive heating means and collecting means for collecting the electromagnetic energy of a variable electromagnetic field emitted by a source located outside the mold, said collecting means being connected to said resistive heating means (34) in which said energy is dissipated. Method for manufacturing this mold. A thermal nanoimprint lithography device comprising said mold. A method for preparing a substrate comprising a surface nanostructured by a thermal nanoimprint lithography technique, wherein said mold is applied.

Abstract: A three terminal magnetic sensing device (TTM) having a trackwidth defined in a localized region by a patterned insulator, and methods of making the same, are disclosed. In one illustrative example, one or more first sensor layers (e.g. which includes a “base” layer) are formed over a collector substrate. A patterned insulator which defines a central opening exposing a top layer of the one or more first sensor layers is then formed. The central opening has a width for defining a trackwidth (TW) of the TTM. Next, one or more second sensor layers are formed over the top layer of the one or more first sensor layers through the central opening of the patterned insulator. The one or more second sensor layers may include a tunnel barrier layer formed in contact with the top layer of the one or more first sensor layers, as well as an “emitter” layer. Various embodiments and techniques are provided.

Abstract: An extraordinary magnetoresistive sensor (EMR sensor) having a lead structure that is self aligned with a magnetic shunt structure. To form an EMR sensor according to an embodiment of the invention, a plurality of layers are deposited to form quantum well structure such as a two dimensional electron gas structure (2DEG). A first mask structure is deposited having two openings, and a material removal process is performed to remove portions of the sensor material from areas exposed by the openings. The distance between the two openings in the first mask defines a distance between a set of leads and the shunt structure. A non-magnetic metal is then deposited. A second mask structure is then formed to define shape of the leads.

Abstract: The invention generally pertains to the field of solid immersion lenses for optical applications in high resolution microscopy. The lens of the invention includes a spherical sector limited by a planar surface and an object having nanometric dimensions arranged on the planar surface at the focus of said solid immersion lens. A light-opaque layer having a central opening with nanometric dimensions can be provided on the planar surface, said opening being centred on the focus of the solid immersion lens. The nano-object can be a tube or a thread having a cylindrical shape. The lens of the invention can be made using lithography techniques.