[Application] Techniques for diamond nucleation control for thin film processing are disclosed. In one particular embodiment, the techniques may be realized as a method for generating a plasma having a plurality of ions; depositing a plurality of diamond nucleation centers on a substrate with the ions in the plasma using an extraction plate having at least one gap, wherein the plasma ions pass through the at least one gap in the extraction plate to generate a focused ion beam to deposit the plurality of diamond nucleation centers; and controlling the growth of a continuous diamond film from the diamond nucleation centers on the substrate by controlling at least one of a temperature around the substrate, a temperature of the plasma, a pressure around the substrate, and a concentration of the ions in the plasma.