# US 2020/0393602 A1 · Multispectral filter

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- Number: US 2020/0393602 A1
- Document ID: US20200393602A1
- Status: Published application
- Kind: A1
- Application number: 16/948,003
- Filed: 2020-08-27
- Published: 2020-12-17
- Earliest claimed: 2017-05-22
- Assignees: Viavi Solutions Inc.
- Applicants: Viavi Solutions Inc.
- Inventors: Georg J. OCKENFUSS
- Web page: https://patentgrep.com/patent/US20200393602A1

## CPC

- G02B 5/286: {having four or fewer layers, e.g. for achieving a colour effect}
- G02B 5/201: {in the form of arrays}
- G02B 5/207: {comprising semiconducting materials}
- G02B 5/28: Interference filters
- G02B 5/281: {designed for the infrared light}
- G02B 5/288: {comprising at least one thin film resonant cavity, e.g. in bandpass filters}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical filter may include a substrate. The optical filter may include a first mirror and a second mirror. Each of the first mirror and the second mirror may include a plurality of quarterwave stacks. The plurality of quarterwave stacks may include a plurality of layers comprising a first material, a second material, and a third material. The optical filter may include a spacer disposed between the first mirror and the second mirror.

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

An optical filter, comprising:
a first mirror and a second mirror,
the first mirror including a plurality of quarterwave stacks,
the plurality of quarterwave stacks including a plurality of layers; and
a spacer disposed between the first mirror and the second mirror,
the optical filter being associated with one or more of a 50% relative bandwidth of between approximately 0.9 nm and approximately 5.3 nm, a 50% relative bandwidth of between approximately 3.75 nm and approximately 5.75 nm, or a 50% relative bandwidth of between approximately 4 nm and approximately 8 nm.

### Claim 22 (depends on 21)

The optical filter of claim 21, where the second mirror includes a different plurality of quarterwave stacks.

### Claim 23 (depends on 21)

The optical filter of claim 21, where the plurality of layers include a first material, a second material, and a third material.

### Claim 24 (depends on 21)

The optical filter of claim 21, where the optical filter is associated with the 50% relative bandwidth of between approximately 0.9 nm and approximately 5.3 nm at a center wavelength of 932 nm.

### Claim 25 (depends on 21)

The optical filter of claim 21, where the optical filter is associated with the 50% relative bandwidth of between approximately 3.75 nm and approximately 5.75 nm at a center wavelength of 800 nm.

### Claim 26 (depends on 21)

The optical filter of claim 21, where the optical filter is associated with the 50% relative bandwidth of between approximately 4 nm and approximately 8 nm at a center wavelength of 1100 nm.

### Claim 27

A multispectral filter, comprising:
a first set of dielectric layers to reflect a portion of light directed toward the first set of dielectric layers,
the first set of dielectric layers including a first one or more quarterwave stacks;
a second set of dielectric layers to reflect a portion of light directed toward the second set of dielectric layers,
the second set of dielectric layers including a second one or more quarterwave stacks, and
a thickness of at least one layer of the first set of dielectric layers or the second set of dielectric layers being detuned from a quarterwave thickness.

### Claim 28 (depends on 27)

The multispectral filter of claim 27, where the quarterwave thickness is a thickness associated with a center wavelength of light that is to be incident on at least one of the first one or more quarterwave stacks or the second one or more quarterwave stacks.

### Claim 29 (depends on 27)

The multispectral filter of claim 27, where the thickness is detuned by an increase between 10% and 50%.

### Claim 30 (depends on 27)

The multispectral filter of claim 27, where the first set of dielectric layers includes a set of three or more different materials.

### Claim 31 (depends on 30)

The multispectral filter of claim 30, where the second set of dielectric layers includes a different set of three or more different materials.

### Claim 32 (depends on 31)

The multispectral filter of claim 31, where the set of three or more different materials and the different set of three or more different materials are a common set of three or more different materials.

### Claim 33 (depends on 27)

The multispectral filter of claim 27,
where the first set of dielectric layers includes a set of three or more different materials, and
where the first one or more quarterwave stacks includes:
a first quarterwave stack that includes a first material of the set of three or more different materials and a second material of the set of three or more different materials a second quarterwave stack, and
a second quarterwave stack that includes the first material and a third material.

### Claim 34 (depends on 33)

The multispectral filter of claim 33,
where the second set of dielectric layers includes a different set of three or more different materials, and
wherein the different set of three or more different materials includes the third material.

### Claim 35 (depends on 27)

The multispectral filter of claim 27, further comprising:
a set of spacer layers,
a layer, of the set of spacer layers, being selected based on a refractive index of the layer.

### Claim 36 (depends on 35)

The multispectral filter of claim 35, wherein the layer corresponds to a wavelength of light that is to be directed toward a sensor element, of a set of sensor elements, corresponding to a channel of a set of channels formed by the set of spacer layers.

### Claim 37

A filter comprising:
a first quarterwave stack including one or more alternating layers of a first material and a second material; and
a second quarterwave stack including one or more alternating layers of a third material and a fourth material,
the first material, the second material, the third material, and the fourth material comprising three or more different materials, and
the filter being associated with one or more of a 50% relative bandwidth of between approximately 0.9 nm and approximately 5.3 nm, a 50% relative bandwidth of between approximately 3.75 nm and approximately 5.75 nm, or a 50% relative bandwidth of between approximately 4 nm and approximately 8 nm.

### Claim 38 (depends on 37)

The filter of claim 37, where the first material is associated with a higher refractive index than the second material.

### Claim 39 (depends on 37)

The filter of claim 37, where the third material is associated with a higher refractive index than the fourth material.

### Claim 40 (depends on 37)

The filter of claim 37,
where the first quarterwave stack and the second quarterwave stack are included in a set of dielectric layers,
where a thickness of at least one layer of the first set of dielectric layers is detuned from a quarterwave thickness, and
where the quarterwave thickness is a thickness associated with a center wavelength of light that is to be incident on at least one of the first quarterwave stack or the second quarterwave stack.