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US 11,112,672 B2Granted
Optical device
AssigneeOxford University Innovation Limited
InventorsPeiman Hosseini, Harish Bhaskaran, Ben Broughton
Life of this patent
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Abstract
An optical device comprising a stack of the following layers: a capping layer; a layer of light absorber material; and a reflective layer, wherein the refractive index of the capping layer is at least 1.6.
Claims28
An optical device comprising a stack of the following layers:
- a capping layer;
- a layer of light absorber material;
- a reflective layer;
- and
- a spacer layer between the reflective layer and the layer of light absorber material, wherein:
- the light absorber material is a phase-change material having a complex refractive index that is settable to at least two values which confer different optical properties to the device;
- one or more heating elements are provided to enable the refractive index of the phase change material to be altered by application of heat using electrical resistive heating;
- and
- the spacer layer comprises a plurality of spacer layer sub-layers, at least two of the spacer layer sub-layers having different refractive indices relative to each other.
6 more elements
An optical device comprising a stack of the following layers:
- a capping layer;
- a layer of light absorber material;
- a reflective layer;
- a spacer layer between the reflective layer and the layer of light absorber material;
- and
- a layer of metallic passive light absorber material, wherein the layer of metallic passive light absorber material is not switchable between different states, further wherein:
- the light absorber material is a phase-change material having a complex refractive index that is settable to at least two values which confer different optical properties to the device;
- the spacer layer comprises a plurality of spacer layer sub-layers, at least two of the spacer layer sub-layers having different refractive indices relative to each other;
- and
- the layer of passive light absorber material is provided within the spacer layer, sandwiched between two of the spacer layer sub-layers, or the layer of passive light absorber material is provided directly adjacent to the spacer layer,
- wherein the stack is configured to provide a plurality of different spectral responses to incident light in a corresponding plurality of different regions.
8 more elements
Dependencies are inferred from the claim text.