Zero-order diffractive filter

US7821691B2 · kind B2 · utility

Assignee

• CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA—RECHERCHE ET DÉVELOPPEMENT · CH

Inventors

• Harald Walter · Horgen, CH
• Gilbert Gugler · Marly, CH
• Alexander Stuck · Wettingen, CH
• Robert Beer · Marly, CH
• Marc Pauchard · Glarus, CH

Key dates

• Filing date: Jul 24, 2007
• Grant date: Oct 26, 2010
• Expiry date: Oct 26, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2207/101
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A Zero-order diffractive filter comprising a first layer (1) with a periodic diffractive microstructure, forming a waveguide, and at least one adjacent second layer (2, 4, 5), wherein said first layer (1) has a refractive index that is higher than the refractive index of said second layer (2, 4, 5) by at least 0.2. At least one of said second layers (2, 4, 5) is a porous layer comprising nanopores. The period Λ of the diffractive microstructure is between 100 nm and 3000 nm.