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

Claim 7:
8. A phase shifting device comprising:
a plurality of phase shift patterns, each of the plurality of phase shift patterns having at least one dimension smaller than a wavelength of visible light,
wherein each of the plurality of phase shift patterns comprises at least one crystallization preventing layer and at least one dielectric layer that are alternately stacked,
wherein the at least one crystallization preventing layer comprises an amorphous material,
wherein a thickness of the at least one crystallization preventing layer is less than a thickness of the at least one dielectric layer,
wherein a root mean square value of surface roughness of an uppermost surface of each of the plurality of phase shift patterns is less than or equal to 2.5 nm, and
wherein a sum of thicknesses of all of the at least one crystallization preventing layer is less than or equal to 5% of a total thickness of all of the at least one crystallization preventing layer and all of the at least one dielectric layer in each of the plurality of phase shift patterns.