Abstract:
The invention concerns a multilevel recording medium for a laser beam read/write system, comprising at least a substrate (4a, 4b) and an assembly of layers forming a deep level (12) and at least a semi-transparent level (10), each of said levels having two stable states reversible under the effect of laser radiation. The invention is characterised in that the semi-transparent level comprises a layer (7) of phase-change material and at least a thermal absorption layer (21) located in front of the phase-change material layer, such that the laser beam passes through the thermal absorption layer before reaching the phase-change material.
Abstract:
A process for producing a substrate (1) for an optical recording medium, equipped with a structured front face and a rear face, comprises: the formation of an upper layer (3), composed of a crosslinkable hybrid organic/inorganic material, obtained by a sol-gel process and that is solvent-free, on a first planar surface (2b) of a lower layer (2) comprising a second planar surface (2a), opposite to the first surface (2b) and forming the rear face of the substrate (1), and the formation of the structured front face of the substrate, by structuring a free face of the upper layer (2) and by crosslinking the crosslinkable hybrid organic/inorganic material.
Abstract:
The invention concerns an optical medium having, on at least one side (10), a surface recording level (20) and an embedded recording level (30), capable of being read and recorded by means of an optical beam having a wavelength ranging between 620 and 670 nanometers, and wherein each of the levels has a reflectivity ranging between 6 % and 12 %.
Abstract:
The recording medium comprises at least a first (L1) and a second (L2) micro-structured stage assembled by an adhesive layer (4) and arranged between micro-structured bottom (2) and top substrates. A polymerizable layer forming the adhesive layer (4) is deposited on the first stage (L1). Then a micro-structured transparent matrix (5) is provisionally placed on the adhesive layer (4) so as to micro-structure the adhesive layer (4). Polymerization of the adhesive (4) is performed by exposure, through the matrix (5), with a polymerization light. Then the matrix (5) is removed and the second stage (L2) is deposited on the micro-structured adhesive layer (4). Then an additional adhesive layer (9) is deposited on the second stage (L2) and the micro-structured matrix (5) is definitively placed on the additional adhesive layer (9) so as to form the top substrate.
Abstract:
A device for reading a biochip including plural molecular recognition areas and plural optical positioning marks, associated with recognition areas. The device includes an optical head capable of projecting excitation light onto the biochip. A device is provided to effectuate relative displacement between the head and the biochip. A first optical analysis system is associated with the optical head to receive any light arriving from recognition areas. A second optical positioning system is associated with the optical head to receive any light from at least one guide track and/or optical positioning mark. A device is further provided for servocontrolling scanning by the optical head. Such a device may find particular application to biological and chemical analysis.
Abstract:
Dispositif de lecture d'une biopuce (10) comportant une pluralité de zones d e reconnaissance moléculaire et une pluralité de repères optiques de positionnement, associés aux zones de reconnaissance, le dispositif comportant: une tête optique (20) apte à projeter sur la biopuce une lumière d'excitation; des moyens (14) et/ou (24) de déplacement relatif de ladite tê te et ladite biopuce; un système optique (40) d'analyse, associé à la tête optique pour recevoir une lumière susceptible de provenir des zones de reconnaissance; un système optique (60) de positionnement, associé à la tête optique pour recevoir une lumière susceptible de provenir d'au moins une pis te de guidage et/ou un repère de positionnement, et des moyens (70) d'asservissement du balayage de la tête optique. Applications à l'analyse biologique et chimique.
Abstract:
L'invention concerne un dispositif optoélectronique (10) comprenant une matrice de diodes électroluminescentes (16) et des blocs photoluminescents (40) en vis-à-vis d'au moins une partie des diodes électroluminescentes, chaque diode électroluminescente ayant une dimension latérale (D1) inférieure à 30 µm, chaque bloc photoluminescent comprenant des cristaux semiconducteurs dont la taille moyenne est inférieure à 1 µm dispersés dans une matrice liante.