Abstract: An optical sensor includes an optical device including a microresonator, laid out to guide a light beam along a closed loop optical path, and an injection and/or extraction waveguide, optically coupled to the microresonator; a photodetector, arranged at the output of the injection and/or extraction waveguide; and an analysis device, receiving a signal supplied by the photodetector, and deducing therefrom information relative to a displacement. The microresonator is constituted of a plurality of elementary waveguides spaced apart from each other, and arranged one after the other according to a loop shaped layout. The optical sensor offers increased sensitivity to the measurement of nanometric displacements.

Abstract: A guided light source that comprises: at least one quantum box associated with a discoid wave guide to achieve cylindrical propagation of a wave front emitted by the at least one quantum box in the discoid wave guide; an annular wave guide surrounding the discoid wave guide and having a grating coupler formed on its internal periphery to receive the wave front in normal incidence; an output wave guide optically coupled to the annular wave guide, in which the wave front is guided. The invention includes the method of fabrication of such a source, and its use for emission of a sequence of single photons.

Abstract: An organic light-emitting diode comprises a first electrode, a stack of semiconducting organic layers, comprising at least one light-emitting organic layer, deposited on top of the first electrode and a second electrode deposited on a surface of the stack opposite the first electrode, wherein the first electrode comprises at least one region in electrical contact with the stack of semiconducting organic layers surrounded by one or more regions electrically insulated from the stack, each electrically insulated region structured to form at least one Bragg mirror adapted to reflect plasmons with a wavelength ? of emission from the light-emitting layer and guided by an interface between the first electrode and the stack of semiconducting organic layers, each region in electrical contact with the stack forming, with the Bragg mirror or mirrors surrounding it, a cavity not supporting any resonant plasmon mode at the wavelength ?. A method for fabricating such an organic light-emitting diode is provided.

Abstract: This photodiode includes: a core of a first waveguide that terminates in a tapered termination that extends above a core, made of germanium or of SiGe, of a second waveguide, a matching strip that extends opposite the tapered termination on one side and opposite the core of the second waveguide on the opposite side, this matching strip being coupled optically to the core of the second waveguide by an evanescent coupling and including a first zone inside which its effective propagation index is equal to the effective propagation index of a second zone of the tapered termination, these first and second zones optically coupling the tapered termination to the matching strip through a modal coupling, and a low-index layer that extends between the matching strip and the tapered termination.

Abstract: This method for measuring the misalignment between a first and a second etching zone includes: producing a plasmonic antenna including a first and a second element that are separate and each delineate a cavity on one respective side, all of the elements of the plasmonic antenna that are situated on a first side of a separating plane being produced entirely inside the first zone and all of the elements of the plasmonic antenna that are situated on the second side of the separating plane being produced entirely inside the second zone, and after the production of the plasmonic antenna, the method includes: measuring the absorption rate of the plasmonic antenna, and determining the magnitude of the misalignment between the first and second zones on the basis of the measured absorption rate and of a predicted value for this absorption rate in the absence of a misalignment.

Abstract: A source of collimated light, in particular a source of single photons. The source comprises a cavity in the shape of an inverted pyramid formed in a substrate. At least one quantum dot (Bq) suitable for emitting light with a wavefront is arranged at the apex of the inverted pyramid and a structure (4) having an index gradient fills the cavity. This structure has an effective index that decreases from the centre of the base towards the sides. Thus, the wavefront of the light emitted by the at least one quantum dot is flattened. The invention extends to the method for manufacturing such a source, and to its use for the emission of a sequence of single photons.

Abstract: A spectral filter is manufactured using a process wherein a first rectangular bar is formed within a first layer made of a first material, said first rectangular bar being made of a second material having a different optical index. The process further includes, in a second layer over the first layer, a second rectangular bar made of the second material. The second rectangular bar is positioned in contact with the first rectangular bar. The second layer is also made of the first material.

Abstract: The invention relates to a photodiode comprising an absorption portion (200), with the absorption portion (200) comprising a core (210) surrounded at least partially by a sheath (220) comprising at least two charge extraction regions (221, 222). The core (210) comprises: a plurality of patterns (211) formed from a first material having the property of generating the displacement of electric charge carriers from photons propagating in the core (210); a confinement layer (212) inside of which the patterns (211) are located; The patterns are arranged periodically along a main extension direction De (z) of said core (210), by having a pitch p. According to an embodiment, the patterns (211) extend mainly along a direction Dm inclined with respect to a direction Dp (x) perpendicular to said main direction De (z).

Abstract: A photonic circuit including a structure of coupling to an external device, the structure including a main waveguide and at least two secondary waveguides, each secondary waveguide having a first portion substantially parallel to the main guide arranged in the vicinity of the main guide to perform an evanescent wave coupling between the main guide and the secondary guide, the first portion extending in a second portion having an end opposite to the first portion defining a coupling surface of the secondary guide, emerging at the level of an external surface of the circuit.

Abstract: An optical device including a waveguide microresonator, laid out to guide a light beam along a closed loop optical path; and at least one injection and/or extraction waveguide, optically coupled to the microresonator for injection and/or extraction of the light beam. The microresonator is composed of a plurality of elementary waveguides with a spacing between them, and located one after the other to form a loop-shaped layout. Among other things, the invention increases the sensitivity of the microresonator to the surrounding medium.

Abstract: An infrared high-pass plasmonic filter includes a copper layer interposed between two layers of a dielectric material. An array of patterned openings extend through the copper layer and are filled with the dielectric material. Each patterned opening is in the shape of a greek cross, with the arms of adjacent patterns being collinear. A ratio of the width to the length of each arm is in the range from 0.3 to 0.6, and the distance separating the opposite ends of arms of adjacent patterns is shorter than 10 nm.

Abstract: A device for detecting electromagnetic radiation includes at least one thermal detector, placed on a substrate; an encapsulating structure forming a cavity housing the thermal detector, including at least one thin encapsulating layer; and at least one Fabry-Perot interference filter, formed by first and second semi-reflective mirrors that are separated from each other by a structured layer. A high-index layer of one of the semi-reflective mirrors is at least partially formed from the thin encapsulating layer.

Abstract: A bolometric detector of LWIR wavelengths, including: a substrate; a membrane suspended above the substrate by supporting elements; an absorbing element comprising several MIM structures each formed with a lower metal element, an upper metal element specific to each MIM structure and with a dielectric element positioned between the lower and upper metal elements; a thermometric element comprising at least one thermometric material; wherein: the membrane includes the upper metal element, the thermometric material and one portion of the dielectric element of each MIM structure, the upper metal elements of at least two MIM structure have different dimensions relatively to each other in the main plane of the membrane, and the dielectric element of each of the MIM structures includes at least one of the following materials having vibrational modes in the LWIR range: Al2O3, AlN, TiO2.

Abstract: A bolometric detector including an absorption membrane, for converting an incident electromagnetic radiation into heat; and a reflector, for reflecting to the absorption membrane part of the incident electromagnetic radiation having passed there through, is provided. The bolometric detector includes a non-metallic layer, situated between the absorption membrane and the reflector, having a series of index jumps, so as to form a network resonating at a wavelength of interest ?0; the mean pitch of the network is less than ?0; and the optical distance between the absorption membrane and the reflector is substantially equal to a multiple of ?0/2.

Abstract: The invention relates to an optical coupler (10) in a vertical configuration, comprising a first waveguide (12) and a second waveguide (14). The optical coupler (10) comprises a third waveguide (16) distinct from the first and second waveguides (12, 14) and extending parallel to the first and second waveguides (12, 14), the third waveguide (16) being arranged between the first waveguide (12) and the second waveguide (14) in a transverse direction (X) perpendicular to the longitudinal direction (Z) and having parameters influencing the evanescent wave coupling between the first waveguide (12) and the second waveguide (14), those parameters being chosen such that the coupling (C) is greater than 15%.

Abstract: An infrared high-pass plasmonic filter includes a copper layer interposed between two layers of a dielectric material. An array of patterned openings extend through the copper layer and are filled with the dielectric material. Each patterned opening is in the shape of a greek cross, with the arms of adjacent patterns being collinear. A ratio of the width to the length of each arm is in the range from 0.3 to 0.6, and the distance separating the opposite ends of arms of adjacent patterns is shorter than 10 nm.

Abstract: A plasmonic optical filter, including: a periodic repetition of metal slabs above a metal surface; dielectric spacers arranged between the slabs and the metal surface so that there exists an empty space between each slab and the metal surface; and an opening between each of said empty spaces and the outside.

Abstract: A spectral filter includes an assembly of filtering cells. Each cell has a same nanostructured pattern and a preferential direction of the pattern. This preferential direction is, for each cell, oriented approximately radially with respect to a single point of the spectral filter. Alternatively, this preferential direction is, for each cell, oriented approximately ortho-radially with respect to the single point of the spectral filter. The single point may be a center point. Alternatively, the single point may correspond to an optical axis of a lens element associated with the spectral filter.

Abstract: A bolometric detector including an absorption membrane, for converting an incident electromagnetic radiation into heat; and a reflector, for reflecting to the absorption membrane part of the incident electromagnetic radiation having passed there through, is provided. The bolometric detector includes a non-metallic layer, situated between the absorption membrane and the reflector, having a series of index jumps, so as to form a network resonating at a wavelength of interest ?0; the mean pitch of the network is less than ?0; and the optical distance between the absorption membrane and the reflector is substantially equal to a multiple of ?0/2.

Abstract: Method for optimising the values of n detection wavelengths of an optical gas sensor capable of carrying out detection of n different gases, comprising the implementation of the following steps: a) calculation of a value of a determinant of an absorptivity matrix ? whose coefficients represent the spectral absorptivity of each of the n gases at n detection wavelengths, step a) being repeated several times, each time modifying at least one of said n detection wavelengths and such that the values of said n detection wavelengths are comprised within a range of values for which the spectral absorptivity of at least one of the n gases is non-zero; b) determination of the values of said n detection wavelengths for which the value of the determinant of the absorptivity matrix ? corresponds to the maximum value amongst the set of previously calculated values.