High performance volume phase gratings
First Claim
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1. An apparatus, comprising:
- an optical substrate configured to manipulate light received from a light source; and
at least one diffractive element in one layer in the optical substrate, each diffractive element being a volume phase grating, and comprising;
a plurality of sub-substrate structures separated from one another by a plurality of valleys, the sub-substrate structures comprising a material having a first refractive index; and
a filler material filling at least partially at least some of the plurality of valleys, the filler material having a second refractive index that is unequal to the first refractive index,wherein the at least one diffractive element has an index modulation value of at least about 0.3,wherein each of the plurality of valleys has a depth of between about 0.5 and 2.0 microns, the depth being from a top to a bottom of the sub-substrate structures,wherein the material of first refractive index comprises at least one of a glass, optical polymer, and a metal oxide.
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Abstract
Provided in one embodiment is an apparatus, comprising: an optical substrate configured to manipulate light received from a light source; and at least one diffractive element in one layer in the optical substrate, each diffractive element comprising: a plurality of sub-substrate structures separated from one another by a plurality of valleys, the sub-substrate structures comprising a material having a first refractive index; and a filler material filling at least partially at least some of the plurality of valleys, the filler material having a second refractive index that is unequal to the first refractive index.
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Citations
15 Claims
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1. An apparatus, comprising:
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an optical substrate configured to manipulate light received from a light source; and at least one diffractive element in one layer in the optical substrate, each diffractive element being a volume phase grating, and comprising; a plurality of sub-substrate structures separated from one another by a plurality of valleys, the sub-substrate structures comprising a material having a first refractive index; and a filler material filling at least partially at least some of the plurality of valleys, the filler material having a second refractive index that is unequal to the first refractive index, wherein the at least one diffractive element has an index modulation value of at least about 0.3, wherein each of the plurality of valleys has a depth of between about 0.5 and 2.0 microns, the depth being from a top to a bottom of the sub-substrate structures, wherein the material of first refractive index comprises at least one of a glass, optical polymer, and a metal oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus, comprising:
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an optical substrate configured to manipulate light received from a light source; and at least one diffractive element in one layer in the optical substrate, each diffractive element being a volume phase grating, and comprising; a plurality of sub-substrate structures separated from one another by a plurality of valleys, the sub-substrate structures comprising a material having a first refractive index; and a filler material filling at least partially at least some of the plurality of valleys, the filler material having a second refractive index that is unequal to the first refractive index; wherein the at least one diffractive element does not comprise a holographic polymer dispersed liquid crystal, wherein the at least one diffractive element has an index modulation value of at least about 0.3, wherein each of the plurality of valleys has a depth of between about 0.5 and 2.0 microns, the depth being from a top to a bottom of the sub-substrate structures, wherein the material of first refractive index comprises at least one of a glass, optical polymer, and a metal oxide. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification