Investigation of microlens mold fabricated by focused ion beam technology
A novel fabrication method of microlens mold, focused ion beam (FIB) milling, is presented in this paper. Substrates with different materials, copper, nickel, and bulk silicon, were used in order to compare their milling quality. Two-dimensional profiles and surface roughness of the fabricated molds were measured using a laser interferometer. Finally, the mold was used for hot embossing replication. The surface roughness (Ra value) of the replica is about 8 nm, and the profile is neat and symmetric. Measured sizes of the replica coincide well with that of the design.
microlens mold hot embossing replication fib milling