Electromagnetic wave reflector and optical device including the same
First Claim
1. An electromagnetic wave reflector comprising:
- a multi-layer structure comprising;
a plurality of first material layers, each of the plurality of first material layers comprising a first material having a first refractive index, wherein all of the plurality of first material layers comprise a same material; and
a plurality of second material layers, each comprising a second material having a second refractive index smaller than the first refractive index,wherein the plurality of first material layers are stacked alternately with the plurality of second material layers,at least a first one of the plurality of first material layers has a thickness that is different from a thickness of at least a second one of the plurality of first material layers,at least a first one of the plurality of second material layers has a thickness that is different from a thickness of at least a second one of the plurality of second material layers,at least one of the plurality of first material layers has a thickness that is different from a thickness of at least one of the plurality of second material layers,the plurality of first material layers comprise a first layer and a second layer, wherein the second layer is farther from an incident surface of the electromagnetic wave reflector than the first layer, and the second layer has a thickness that is smaller than a thickness of the first layer,a largest thickness of the plurality of first material layers is greater than a smallest thickness of the plurality of second material layers, wherein one layer of the plurality of second material layers having the smallest thickness is arranged between two of the plurality of first material layers,one of the plurality of first material layers is present at each end of the multi-layer structure according to a stacking direction thereof,the plurality of first material layers comprise a primary layer, a secondary layer, a tertiary layer and a quaternary layer which are sequentially arranged from the incident surface with no intervening first material layer therebetween, the primary layer directly contacting the incident surface,the plurality of first material layers are disposed such that one of;
the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer increases, decreases, and increases again in an order from the incident surface to a surface opposite the incident surface, andthe thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer decreases, increases, and increases again in the order from the incident surface to the surface opposite the incident surface,a reflectance of the multi-layer structure is equal to or greater than 90%, anda total number of layers of the multi-layer structure is equal to or less than 15.
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Accused Products
Abstract
Provided are electromagnetic wave reflectors and optical devices including the same. An electromagnetic wave reflector may include a plurality of layers which have an aperiodic structure and/or thickness. The plurality of layers may satisfy a condition of spatial coherence with respect to electromagnetic waves. The electromagnetic wave reflector may include a plurality of first material layers including a first material having a first refractive index and a plurality of second material layers including a second material having a second refractive index different from the first refractive index. At least two of the plurality of first material layers may have different thicknesses. At least two of the plurality of second material layers may have different thicknesses. At least one of the plurality of first material layers and at least one of the plurality of second material layers may have different thicknesses.
22 Citations
28 Claims
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1. An electromagnetic wave reflector comprising:
a multi-layer structure comprising; a plurality of first material layers, each of the plurality of first material layers comprising a first material having a first refractive index, wherein all of the plurality of first material layers comprise a same material; and a plurality of second material layers, each comprising a second material having a second refractive index smaller than the first refractive index, wherein the plurality of first material layers are stacked alternately with the plurality of second material layers, at least a first one of the plurality of first material layers has a thickness that is different from a thickness of at least a second one of the plurality of first material layers, at least a first one of the plurality of second material layers has a thickness that is different from a thickness of at least a second one of the plurality of second material layers, at least one of the plurality of first material layers has a thickness that is different from a thickness of at least one of the plurality of second material layers, the plurality of first material layers comprise a first layer and a second layer, wherein the second layer is farther from an incident surface of the electromagnetic wave reflector than the first layer, and the second layer has a thickness that is smaller than a thickness of the first layer, a largest thickness of the plurality of first material layers is greater than a smallest thickness of the plurality of second material layers, wherein one layer of the plurality of second material layers having the smallest thickness is arranged between two of the plurality of first material layers, one of the plurality of first material layers is present at each end of the multi-layer structure according to a stacking direction thereof, the plurality of first material layers comprise a primary layer, a secondary layer, a tertiary layer and a quaternary layer which are sequentially arranged from the incident surface with no intervening first material layer therebetween, the primary layer directly contacting the incident surface, the plurality of first material layers are disposed such that one of; the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer increases, decreases, and increases again in an order from the incident surface to a surface opposite the incident surface, and the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer decreases, increases, and increases again in the order from the incident surface to the surface opposite the incident surface, a reflectance of the multi-layer structure is equal to or greater than 90%, and a total number of layers of the multi-layer structure is equal to or less than 15. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electromagnetic wave reflector comprising:
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a multi-layer structure comprising a plurality of stacked layers comprising a plurality of first material layers stacked alternately with a plurality of second material layers, wherein at least three layers of the multi-layer structure have different thicknesses from one another to satisfy a spatial coherence condition, a total number of the plurality of stacked layers is equal to or less than 15, and a reflectance of the multi-layer structure is equal to or higher than 90%, each of the plurality of first material layers comprises a first material having a first refractive index, and each of the plurality of second material layers comprises a second material having a second refractive index smaller than the first refractive index, wherein all of the plurality of first material layers comprise a same material, the plurality of first material layers comprise a first layer and a second layer, wherein the second layer is farther from an incident surface of the electromagnetic wave reflector than the first layer, and the second layer has a thickness that is smaller than a thickness of the first layer, a largest thickness of the plurality of first material layers is greater than a smallest thickness of the plurality of second material layers, wherein one layer of the plurality of second material layers having the smallest thickness is arranged between two of the plurality of first material layers, one of the plurality of first material layers is present at each end of the multi-layer structure according to a stacking direction thereof, the plurality of first material layers comprise a primary layer, a secondary layer, a tertiary layer and a quaternary layer which are sequentially arranged from the incident surface with no intervening first material layer therebetween, the primary layer directly contacting the incident surface, and the plurality of first material layers are disposed such that one of; the thickness of the primary layer, the secondary layer, the tertiary layer and the quaternary layer increases, decreases, and increases again in an order from the incident surface to a surface opposite the incident surface, and the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer decreases, increases, and increases again in the order from the incident surface to the surface opposite the incident surface. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An optical device comprising:
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a first reflective layer; a second reflective layer spaced apart from the first reflective layer; and an active layer disposed between the first reflective layer and the second reflective layer, wherein the first reflective layer comprises a multi-layer structure comprising; a plurality of first material layers, each comprising a first material having a first refractive index, wherein all of the plurality of first material layers comprise a same material, and a plurality of second material layers, each comprising a second material having a second refractive index smaller than from the first refractive index, wherein a first one of the plurality of first material layers has a thickness that is different from a thickness of a second one of the plurality of first material layers, wherein a first one of the plurality of second material layers has a thickness that is different from a thickness of a second one of the plurality of second material layers, wherein at least one of the plurality of first material layers has a thickness that is different from a thickness of at least one of the plurality of second material layers, the plurality of first material layers comprise a first layer and a second layer, wherein the second layer is farther from an incident surface of the first reflective layer than the first layer, and the second layer has a thickness that is smaller than a thickness the first layer, a largest thickness of the plurality of first material layers is greater than a smallest thickness of the plurality of second material layers, wherein one layer of the plurality of second material layers having the smallest thickness is arranged between two of the plurality of first material layers, one of the plurality of first material layers is present at each end of the multi-layer structure according to a stacking direction thereof, the plurality of first material layers comprise a primary layer, a secondary layer, a tertiary layer and a quaternary layer which are sequentially arranged from the incident surface with no intervening first material layer therebetween, the primary layer directly contacting the incident surface, the plurality of first material layers are disposed such that one of; the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer increases, decreases, and increases again in an order from the incident surface to a surface opposite the incident surface, and the thicknesses of the primary layer, the secondary layer, the tertiary layer and the quaternary layer decreases, increases, and increases again in the order from the incident surface to the surface opposite the incident surface, a reflectance of the multi-layer structure is equal to or higher than 90%, and a total number of stacked layers of the multi-layer structure is equal to or less than 15. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification