Gray-tone lithography for precise control of grating etch depth

This invention describes a method to precisely control the thickness of a coating layer applied over a microscopic patterned surface, known as a surface-relief grating. It involves first applying a coating that fills the grating's grooves, then adding a light-sensitive material on top. A gray-scale mask, which has varying transparency, is used to expose this material, allowing for precise shaping of the final coating thickness across the entire patterned surface.

Why it matters: Filed before the significant acceleration in demand for high-precision optical components for augmented and virtual reality devices. The method's ability to precisely control grating parameters and overcoat thickness is now critical for manufacturing advanced waveguides and displays.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedCleanroom, photolithography equipment, custom masks

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