Abstract:
The present invention concerns a confocal chromatic device for inspecting the surface of an object (10) such as a wafer, comprising a plurality of optical measurement channels with collection apertures (14) arranged for collecting the light reflected by the object (10) through a chromatic lens (13) at a plurality of measurement points (15), and a magnifying lens (31) arranged for introducing a variable or changeable scaling factor between the spatial repartition of the collection apertures (14) and the measurement points (15). The present invention concerns also a method for inspecting the surface of an object (10) such as a wafer comprising tridimensional structures (11).
Abstract:
A multichannel confocal sensor comprises a light source (14),a focusing lens arrangement (10), and an optical detector (25). This sensor further includes: - a first integrated optics circuit (11) arranged for splitting a light beam (24) coming from said broadband light source into a plurality of emitted light beams applied to a high-density array of emitting apertures (29), - a second integrated optics circuit (20) arranged for collecting on a plurality of collection apertures (18) a plurality of reflected light beams from a sample to be inspected (17) and for transferring said reflected light beams to the optical detector (25), - a beam splitter (22) arranged (i) for directing said emitted light beams from the first integrated optics circuit (11) to the inspected substrate (17) through the focusing lens arrangement (10) and (ii) for directing the reflected light beams from the inspected sample (17) through the focusing lens arrangement (10) into the second integrated optics circuit (20).
Abstract:
L'invention concerne un procédé d'inspection d'une plaquette (2) pour l'électronique, l'optique ou l'optoélectronique, comprenant : la mise en rotation de la plaquette (2) autour d'un axe de symétrie (X) perpendiculaire à une surface principale (S) de ladite plaquette, l'émission, à partir d'une source lumineuse (20) couplée à un dispositif interférométrique (30), de deux faisceaux lumineux incidents de sorte à former, à l'intersection entre les deux faisceaux, un volume de mesure (V) contenant des franges d'interférences, la collecte d'au moins une partie de la lumière diffusée par ladite région de la plaquette, l'acquisition de la lumière collectée et l'émission d'un signal électrique représentant la variation de l'intensité lumineuse de la lumière collectée en fonction du temps, la détection, dans ledit signal, d'une composante fréquentielle dans ladite lumière collectée, ladite fréquence étant la signature temporelle du passage d'un défaut dans le volume de mesure.
Abstract:
Dispositif d'inspection (1) d'une surface (S) d'un objet, le dispositif comprenant une source de lumière polychromatique (20) pour projeter un faisceau d'inspection sur la surface (S); un masque confocal (6a, 6b) interceptant le faisceau d'inspection et un faisceau réfléchi par la surface, présentant une pluralité d'ouvertures de filtrage chromatique; un système chromatique (3) étalant spatialement la focalisation du faisceau d'inspection selon des plans de focalisation le long d'un axe optique (AO) dans une profondeur de champ, interceptant le faisceau réfléchi pour le projeter sur un plan de détection (P) conjugué des plans de focalisation; un support mobile (4) pour positionner la surface (S) dans la profondeur de champ; un capteur d'image à intégration temporisée (5) synchronisé au déplacement de la surface, le capteur d'image (5) comprenant une matrice de photodétecteurs disposée dans le plan de détection (P), les ouvertures de filtrage chromatique du masque confocal éclairant une partie des photodétecteurs.
Abstract:
The present invention concerns a confocal chromatic device for inspecting the surface of an object (10) such as a wafer, comprising a plurality of optical measurement channels (24) with collection apertures (14) arranged for collecting the light reflected by the object (10) through a chromatic lens (13) at a plurality of measurement points (15), said plurality of optical measurement channels (24) comprising optical measurement channels (24) with an intensity detector (20) for measuring a total intensity of the collected light. The present invention concerns also a method for inspecting the surface of an object (10) such as a wafer comprising tridimensional structures (11).
Abstract:
The present invention concerns a method for inspecting the surface of an object (10) such as a wafer comprising tridimensional structures (11), using a confocal chromatic device with a plurality of optical measurement channels (24) and a chromatic lens (13) allowing optical wavelengths of a broadband light source (19) to be focused at different axial distances defining a chromatic measurement range, the method comprising a step of obtaining an intensity information corresponding to the intensity of the light actually focused on an interface of the object (10) within the chromatic measurement range at a plurality of measurement points (15) on the object (10) by measuring a total intensity over the full spectrum of the light collected by at least some of the optical measurement channels (24) in a confocal configuration.
Abstract:
The present invention concerns a confocal chromatic device, comprising : at least one chromatic lens (13) with an extended axial chromatism; at least one broadband light source (19); at least one optical detection means (20, 21); and at least one measurement channel (24) with a planar Y-junction (18) made with a planar waveguide optics technology, and arranged for transferring light from said at least one light source (19) towards said at least one chromatic lens (13) and for transferring light reflected back through said at least one chromatic lens (13) towards said at least one optical detection means (20, 21).