Centre National De La Recherche Scientifique

Université´ D'aix-Marseille

Université Du Maine

Ecole Centrale De Marseille

Oberthur Fiduciaire Sas

Fabien Lemarchand

Myriam Zerrad

Xavier Borde

Claude Amra

Julien Gillot

Antonin Moreau

Julien Lumeau

Dominique Ausserré

Ludovic Roussille

Thomas Begou

The present invention particularly relates to a method for physical vacuum deposition of a coating (R) comprising at least one material (M) on at least a portion of a front face () of a support (), said at least one material (M) originating from an evaporation source or an atomisation source (), wherein: —use is made of a support (), at least a portion of the front face () of which is smooth, that is to say, does not have any roughness and/or reliefs and/or recesses; —said vacuum deposition is carried out while varying the thickness distribution of the material (M) on said front face (), that is, while progressively varying the thickness deposited, from a central region () in the direction of at least one lateral region () contiguous to the central region (), without modifying the position of the evaporation source or atomisation source () of the material particles (M).

Method for vacuum deposition of a coating on the front face of a support, support and corresponding security document

The invention relates to a method for observing a sample under optical microscopy, in incoherent, unpolarised light, using a sample substrate including a contrast-amplifying layer having a complex index of refraction. The invention also relates to a method for detecting or metering at least one chemical or biological species using such a sample substrate.

Optical methods for observing samples and for detecting or metering chemical or biological species

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Cabries, France

Fabien Lemarchand