With reference to FIGS. 5(B) and 6, an initiator 60 is formed by depositing a layer 59 of titanium/nickel/gold (Ti/Ni/Au) on the backside of the substrate 52 over the silicon dioxide layer 53 and then attaching the Ti/Ni/Au layer 59 to a header 62, which is preferably formed from a ceramic or a metal alloy, such as Kovar.