Abstract: A rotor of a fluid machine includes a wheel with a plurality of blades. Furthermore, the rotor includes an inter-blade area defined circumferentially between a first blade and a second blade of the plurality of blades with respect to the axis of rotation. Moreover, the rotor includes a balancing mark on the wheel and within the inter-blade area. The balancing mark is elongate and has a first end and a second end. The first end and the second end are stepped axially into the inter-blade area. The balancing mark extends arcuately between the first end and the second end. The balancing mark has a depth that varies as the balancing mark extends arcuately between the first end and the second end. The balancing mark has a width that varies as the balancing mark extends arcuately between the first end and the second end.

Abstract: The photodetector includes a photon absorbing region formed by a first semiconductor material having a first bandgap energy value. It also includes a blocking region formed by at least second and third semiconductor materials configured to prevent the majority charge carriers from passing between the photon absorbing region and a contact region, the second semiconductor material presenting a second bandgap energy value higher than the first bandgap energy value to form a quantum well with the third semiconductor material. The blocking region is doped.

Abstract: The photodetector includes a photon absorbing region formed by a first semiconductor material having a first bandgap energy value. It also includes a blocking region formed by at least second and third semiconductor materials configured to prevent the majority charge carriers from passing between the photon absorbing region and a contact region, the second semiconductor material presenting a second bandgap energy value higher than the first bandgap energy value to form a quantum well with the third semiconductor material. The blocking region is doped.

Abstract: The invention relates to a multispectral imaging device comprising a multiple-quantum-well structure operating on inter-sub-band transitions by absorbing radiation at a wavelength ? lying within a set of wavelengths to which said structure is sensitive, said structure comprising a matrix of individual detection pixels, characterized in that the matrix is organized in subsets (Eij) of four individual detection pixels, a first individual detection pixel (P?1) comprising a first diffraction grating (R?1) sensitive to a first subset of wavelengths, a second individual detection pixel (P?2) comprising a second diffraction grating (R?2) sensitive to a second subset of wavelengths, a third individual detection pixel (P?3) comprising a third diffraction grating (R?3) sensitive to a third subset of wavelengths and a fourth individual detection pixel (P??) not comprising a wavelength-selective diffraction grating, the first, second and third subsets of wavelengths belonging to the set of wavelengths to which said struc

Abstract: The invention relates to a detector comprising a multiple quantum well structure operating on interband or intersubband transitions by absorption of radiation having a wavelength ? having a polarization comprising a component perpendicular to the plane of the multiple quantum well structure, and comprising optical coupling means for coupling said radiation, wherein the coupling means comprise a set of first diffractive lamellar features that are distributed along at least a first direction and a set of second diffractive lamellar features that are distributed along at least a second direction, said first and second directions being mutually perpendicular and lying in a plane parallel to the plane of the multiple quantum well structure.

Abstract: The invention relates to a multispectral imaging device comprising a multiple-quantum-well structure operating on inter-sub-band transitions by absorbing radiation at a wavelength ? lying within a set of wavelengths to which said structure is sensitive, said structure comprising a matrix of individual detection pixels, characterized in that the matrix is organized in subsets (Eij) of four individual detection pixels, a first individual detection pixel (P?1) comprising a first diffraction grating (R?1) sensitive to a first subset of wavelengths, a second individual detection pixel (P?2) comprising a second diffraction grating (R?2) sensitive to a second subset of wavelengths, a third individual detection pixel (P?3) comprising a third diffraction grating (R?3) sensitive to a third subset of wavelengths and a fourth individual detection pixel (P??) not comprising a wavelength-selective diffraction grating, the first, second and third subsets of wavelengths belonging to the set of wavelengths to which said struc

Abstract: The invention relates to a polarimetric imaging device comprising a multiple-quantum-well structure operating on inter-sub-band transitions by absorbing radiation at a wavelength ?, said structure comprising a matrix of individual detection pixels, characterized in that the matrix is organized in subsets of four individual pixels, a first pixel comprising a first diffraction grating (RP1) sensitive to a first polarization, a second polarimetric pixel comprising a second diffraction grating (RP2) sensitive to a second polarization orthogonal to the first polarization, a third polarimetric pixel comprising a third diffraction grating (RP3) sensitive to a third polarization oriented at an angle between the first and second polarizations and a fourth pixel not comprising a polarization-selective diffraction rating (R2D).

Abstract: The invention relates to a detector comprising a multiple quantum well structure operating on interband or intersubband transitions by absorption of radiation having a wavelength ? having a polarization comprising a component perpendicular to the plane of the multiple quantum well structure, and comprising optical coupling means for coupling said radiation, wherein the coupling means comprise a set of first diffractive lamellar features that are distributed along at least a first direction and a set of second diffractive lamellar features that are distributed along at least a second direction, said first and second directions being mutually perpendicular and lying in a plane parallel to the plane of the multiple quantum well structure.