Patent · US Active

Optical filter with nanostructured layers and spectral sensor having layers of such kind

US11977248B2 · kind B2 · utility

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9Claims

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Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Wladimir Tschekalinskij · Nuremberg, DE
Stephan Junger · Bubenreuth, DE

Key dates

Filing date	Jul 14, 2021
Grant date	May 7, 2024
Priority date	—
Expiry date	Sep 9, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/20
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The present invention relates to an optical filter with nanostructured layers and spectral sensors with layers of such kind. The optical filter has at least two nanostructured layers, each of which forms a transmission grating from grating wires extending parallel to each other. The grating wires of the two transmission gratings intersect each other and are positioned one on top of the other in the optical filter. An optical polarise which polarises incident optical radiation linearly parallel to the grating wires of one of the two transmission gratings is arranged over the transmission gratings. The optical filter can be produced as a bandpass filter with standard semiconductor processes without additional layers or modification of said processes.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.