Patent ID: 11886111
Assignee: APPLIED MATERIALS, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. An optical device, comprising:
a base substrate, wherein the base substrate has a target thickness distribution, the target thickness distribution defined by a distance between a top surface and a bottom surface of the base substrate; and
a plurality of optical device structures formed in the base substrate, wherein depths of at least two of the optical device structures in the base substrate are different, the depths in the base substrate corresponding to the target thickness distribution, wherein the optical device is formed by:
measuring a base substrate thickness distribution across the base substrate;
determining a target thickness change, the target thickness change determined by subtracting the base substrate thickness distribution from the target thickness distribution;
forming the target thickness distribution in the base substrate by disposing a resist over the base substrate and developing the resist utilizing a lithography process to form a gray-tone distribution having a thickness distribution corresponding to the target thickness distribution; and
forming a plurality of optical device structures in the base substrate, wherein the plurality of optical device structures correspond to the target thickness distribution.