Technique for determining presence of a species in a sample

US11802792B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• John A. Wheatley · Stillwater, US
• Gilles J. Benoit · Cambridge, US
• Guanglei Du · Riverside, US
• Rolf W. Biernath · Wyoming, US
• Sara S. Merritt · Grant, US
• James M. Hillis · Bloomington, US
• Owen M. Anderson · Minneapolis, US
• Timothy J. Nevitt · Red Wing, US

Key dates

• Filing date: Nov 1, 2021
• Grant date: Oct 31, 2023
• Expiry date: May 14, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/201
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A technique of determining the presence of a species in a sample may include passing light through an optical filter. In an example, the optical filter may include a spatially variant microreplicated layer optically coupled to a wavelength selective filter. The wavelength selective filter may have a light incidence angle-dependent optical band. The spatially variant microreplicated layer may be configured to transmit light to a first optical region of the wavelength selective filter at a first predetermined incidence angle and to a second optical region of the wavelength selective filter at a second predetermined incidence angle.