Optical filtering device including fabry-perot cavities comprising first and second structured layers

US10571612B2 · kind B2 · utility

Assignee

• COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

• Laurent Frey · Fontaine, FR
• Bruno Mourey · Paris, FR

Key dates

• Filing date: May 4, 2015
• Grant date: Feb 25, 2020
• Expiry date: Oct 20, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J2003/2826
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A filtering device comprising first and second interference filters each comprising a Fabry-Perot cavity formed by semi-reflective layers between which a structured layer is arranged, wherein the structured layer belongs conjointly to the two filters, has a substantially constant thickness, is substantially planar and comprises two materials with different refractive indices arranged in each of the cavities, forming vertical structurings, the cavity of the second filter comprises a spacer arranged between one of the semi-reflective layers and the structured layer so that a distance between the semi-reflective layers of the cavity of the second filter is greater than a distance between the semi-reflective layers of the cavity of the first filter, and the filters comprise a second structured layer arranged in the cavities of the filters, and/or each filter comprises a second Fabry-Perot cavity comprising a third structured layer.