Patent ID: 11899293
Assignee: HYPERLIGHT CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method of providing an optical device, comprising:
providing a hard mask layer on a ferroelectric nonlinear optical layer, the ferroelectric nonlinear optical layer including at least one ferroelectric nonlinear optical material;
providing a mask on the hard mask layer, the mask having a pattern formed using ultraviolet (UV) lithography;
forming a hard mask from the hard mask layer by transferring the pattern to the hard mask layer, the forming including performing a first etch for removing a portion of the hard mask layer to form the hard mask; and
transferring the pattern from the hard mask to the ferroelectric nonlinear optical layer to form at least a portion of the optical device including a sidewall of the at least one ferroelectric nonlinear optical layer, the transferring the pattern including performing a second etch for removing a portion of the at least one ferroelectric nonlinear optical layer to form the sidewall, the second etch being selected from a dry etch, a reactive ion etch (RIE), a plasma etch and a chemical etch, the second etch being different from the first etch such that the sidewall has a short range root mean square roughness of less than ten nanometers.