Patent ID: 11947238
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A thin-film material comprising:
alternately stacked dielectric amorphous layers and crystallization preventing amorphous layers,
wherein a thickness of each of the dielectric amorphous layers is less than a thickness at which the dielectric amorphous layers crystallize,
wherein an uppermost layer of the thin-film material is a dielectric amorphous layer,
wherein a root mean square value of a surface roughness of the uppermost layer is less than or equal to 2.5 nm, and
wherein a sum of thicknesses of all of the crystallization preventing amorphous layers is less than or equal to 5% of a total thickness of all of the crystallization preventing amorphous layers and all of the dielectric amorphous layers.