US 12,169,286 B2
Device for creating a patterned evanescent field on a surface and method therefor
Alexei Grichine, St Egrève (FR); and Olivier Destaing, Grenoble (FR)
Assigned to UNIVERSITÉ GRENOBLE ALPES, Saint Martin d'Hères (FR); and CNRS (CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE), Paris (FR)
Appl. No. 17/611,421
Filed by UNIVERSITÉ GRENOBLE ALPES, Saint Martin d'Hères (FR); and CNRS (CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE), Paris (FR)
PCT Filed May 13, 2020, PCT No. PCT/IB2020/054529
§ 371(c)(1), (2) Date Nov. 15, 2021,
PCT Pub. No. WO2020/230051, PCT Pub. Date Nov. 19, 2020.
Claims priority of application No. 1905159 (FR), filed on May 16, 2019.
Prior Publication US 2022/0214556 A1, Jul. 7, 2022
Int. Cl. G02B 21/16 (2006.01); G01N 21/64 (2006.01); G02B 21/08 (2006.01); G02B 27/56 (2006.01)
CPC G02B 27/56 (2013.01) [G01N 21/6458 (2013.01); G01N 21/648 (2013.01); G02B 21/082 (2013.01); G02B 21/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. Device for creating a patterned evanescent field on a surface of a diopter separating two media of respective refractive indices n1 and n2, wherein the device comprises:
an objective lens, the surface of the diopter being arranged in an image focal plane of the objective lens,
a light injection element emitting a collimated light beam of diameter d,
an optical assembly between the light injection element and the objective lens whereby an object plane of the objective lens is optically conjugate with an image plane of the light injection element, the optical assembly being configured so that the collimated light beam from the light injection element is emitted towards the objective lens to be refracted towards the diopter surface with a minimum angle of incidence θmin greater than or equal to a critical angle θc so that the collimated light beam undergoes total internal reflection on the diopter surface to generate an evanescent wave on the diopter surface,
an optical device for forming patterns in an object plane of the light injection element, which is mounted off-axis with respect to an optical axis of the objective lens, in such a way that a pattern formed by the optical device for forming patterns in transmitted light on the light beam in the object plane of the light injection element is found on the surface of the diopter, the light beam reflected by the surface being reflected towards the objective lens to be focused in a back focal plane of the objective lens,
wherein the light beam reflected by the surface of the diopter towards the objective lens does not result from optical interference of one or more incident beams.