Thales

Thomson-csf

Sofradir

Eric Costard

Philippe Bois

Marcel-Francis Audier

Eric Herniou

Alfredo De Rossi

Alexandru Nedelcu

Marcel Francis Audier

Nadia Briere De L'Isle

Pascal Krapf

M Alexandru Nedelcu

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 &#x3bb; 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 (E) of four individual detection pixels, a first individual detection pixel (P) comprising a first diffraction grating (R) sensitive to a first subset of wavelengths, a second individual detection pixel (P) comprising a second diffraction grating (R) sensitive to a second subset of wavelengths, a third individual detection pixel (P) comprising a third diffraction grating (R) 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 structure is sensitive.

Multispectral imaging device based on multiple quantum wells

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 &#x3bb; 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.

Electromagnetic wave detector with an optical coupling surface comprising lamellar patterns

The invention relates to an optical coupling structure intended to couple electromagnetic radiation to the surface of a photodetector, wherein a coupling surface paved along mutually perpendicular first and second directions by a set of N series (M1i, M2i, . . . . Mni) of first features, second features, . . . nth features, the features being identical within any one series, the features being distributed along the first and second directions, the distance between the centers of two adjacent features or the inter-reticular distances between two adjacent features being variable. The subject of the invention is also a detector or a laser source comprising said coupling structure.

Amorphous optical coupling structure for an electromagnetic wave detector and associated detector

Polarimetric optical device with an insulating layer between detectors

A bi-functional optical detector including a first active photoconduction detection element configured to detect light within first and second wavelength ranges, a first diffraction grating associated with the first detection element and configured to couple the light within the first wavelength range so that the first active photoconducting detection element detects the light in the first wavelength range, a second active photoconduction detection element configured to detect light within the first and second wavelength ranges, and a second diffraction grating associated with the second detection element and configured to couple the light within the second wavelength range so that the second active photoconduction detection element detects the light in the second wavelength range. Also included is a third active photoconduction detection element associated with the first detection element and configured to detect the light within the first and second wavelength ranges, a fourth active photoconduction detection element associated with the second detection element and configured to detect the light within the first and second wavelength ranges, and a common contact layer separating the first and second detection elements from the third and fourth detection elements.

Bi-functional optical detector including four optical detectors used to detect combination of two wavelengths

Electromagnetic wave detector using quantum wells and subtractive detectors

The disclosure relates to a bispectral electromagnetic wave detector including at least one first and one second overlaid plane active detector elements separated by a common layer, said first and second detector elements being sensitive to the different wavelengths; a first means of connection connected in common to said first and second detector elements, a second means of connection connected to said first detector element, and a third means of connection connected to said second detector element; means for applying successively a control voltage to each means of connection; and means connected to said first means of connection to detect a photoconduction current each time a control voltage is applied. The invention is used in applications requiring detection of electromagnetic waves in two bands of different wavelengths.

Bispectral electromagnetic wave detector

An electromagnetic wave detector having a first detector element including an active photoconducting material capable of detecting a band of wavelength and a second detector element including an active photoconducting material capable of detecting the same band of wavelength. A common layer is positioned between the first and second detector elements. A first and second connectors are configured to connect to the first and second detector elements, respectively. A third connector is configured to connect in common to the first and second detector elements. The detector further includes contact mechanisms configured to apply control voltages where the voltage applied to the third connector has a value between the values applied to the first and second connectors. A reading circuit connected to the third connector reads a photoconduction current difference between the first and the second detector elements. The applied control voltages are adjusted voltages such that the dark currents or the sums of the dark currents and the background light-currents generated in the two detector elements are equal.

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Massy, France

Eric Costard