US 11,906,765 B2Granted

Ultra-thin thin-film optical interference filters

OwnerEsmaeil Banaeiinventor

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Abstract

A thin-film interference filter has a thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of repeat unit blocks. The thin-film interference filter is flexible enough to be bendable to a radius of curvature of 250 mm or even less without permanently damaging the thin-film interference filter. The thin-film interference filter may have a second thin-film interference multi-layer stack composed of individual thin-film layers arranged in repeat unit blocks may have a different optical transmission spectrum. At least one interlayer between the first thin-film interference multi-layer stack and the second thin-film interference multi-layer stack may block a range of wavelengths of infrared, visible, or ultraviolet light. A defect layer of a different optical thickness than neighboring thin-film layers forming the repeat unit blocks, thereby creating a Fabry Perot resonance cavity.

Claims22

Dependent claims

A thin-film interference filter comprising:

a first thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of first repeat unit blocks;
a second thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of second repeat unit blocks;
and
at least one interlayer between the first thin-film interference multi-layer stack and the second thin-film interference multi-layer stack,
wherein the second thin-film interference multi-layer stack has a different optical transmission spectrum than the first thin-film interference multi-layer stack,
wherein the at least one interlayer has a thickness that is 10-1000 times thicker than that of each individual thin-film layer in the first thin-film interference multi-layer stack,
wherein the thin-film interference filter is flexible enough to be bendable to a radius of curvature of 250 mm or less without permanently damaging, deforming or cracking the thin-film interference filter as a whole, or the thin-film layers in the at least one multi-layer stack, and
wherein the total thickness of the thin-film interference filter is within the range of 0.05 mm to 1 mm.

5 more elements

A thin-film interference filter comprising a first thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of first repeat unit blocks,

wherein the individual thin-film layers of at least two of the repeat unit blocks are arranged in identical orders of refractive indices,
wherein the individual thin-film layers of at least two of the unit blocks are arranged in identical orders of thicknesses,
wherein each of the individual thin-film layers of one unit block has a thickness differing from a respective individual thin-film layer of another unit block by a constant scaling factor such that the one unit block differs from the other unit block by the constant scaling factor,
wherein the thin-film interference filter is flexible enough to be bendable to a radius of curvature of 250 mm or less without permanently damaging, deforming or cracking the thin-film interference filter as a whole, or the thin-film layers in the at least one multi-layer stack, and
wherein the total thickness of the thin-film interference filter is within the range of 0.05 mm to 1 mm.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/634,505Filed 7 Aug 2018 · us provisional application
Priority: 7 Aug 2017
Published: US 2020/0233131 A123 Jul 2020
Granted: 20 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G02B 5/28
Filters: interference filters
G02B 5/285
Interference filters: comprising deposited thin solid films
G02B 1/111
Anti-reflection coatings: using layers comprising organic materials
G02B 1/115
Using inorganic layer materials only: multilayers

Family

Application62/541,937Us provisional application · filed 7 Aug 2017
US 2020/0233131 A1Pre-grant publication · published 23 Jul 2020
US 11,906,765 B2This patent

From the US filing history. Foreign family members aren’t listed.

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