Patent ID: 8237104
Filing Date: 2012-08-07
Classification: G02B

Abstract:
1. Device for trapping particles contained in a liquid (L) placed in a tank, characterised in that it comprises a substrate that is transparent at a working wavelength, a thin layer of material with non-linear optical properties that are reversible at the working wavelength and which is fixed to a first face of the transparent substrate to form all or part of at least one wall of the tank in contact with the liquid, a device for forming an optical trap with optical near-field effect which comprises a laser source which emits a laser beam at the working wavelength and means for forming a waist of the laser beam, said means being positioned in relation to the transparent substrate so that the laser beam is incident upon that second face of the transparent substrate that lies on the opposite side to the first face and the waist of the laser beam being formed in the thin layer, an evanescent electromagnetic field forming in the extension of the waist of the laser beam, at the surface of the thin layer.