CPC G02B 5/1809 (2013.01) [G02B 5/1857 (2013.01); G02B 5/285 (2013.01)] | 13 Claims |
1. A dielectric grating apparatus, comprising:
a substrate;
a grating layer, disposed above the substrate;
a first interference layer, disposed above the substrate; and
a second interference layer, disposed above the substrate,
wherein the grating layer is contacted with the first interference layer directly, and the first interference layer is the same material as the grating layer,
wherein a refractive index of a material of the second interference layer is greater than a refractive index of a material of the first interference layer, and
wherein the first interference layer and the second interference layer are disposed in the grating layer.
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