Abstract:In this paper, we present a novel process for the fabrication of thin diaphragms in lithium niobate (LiNbO3) wafers for various sensor applications. The process uses a thermal inversion layer as an etch stop. Thermal inversion is a process which forms a layer with a poling direction opposite to that of the bulk crystal. The thermal inversion layer can be used as an etch stop because the etch rate on the +Z face in hydrofluoric acid is much slower than that on the -Z face. The thickness of the thermal inversion… Show more
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