Bracket assemblies for use with actuators are described. Electrodes create an electric field along a length of the analyte chamber to drive molecules toward an interaction region containing a nanopore, thereby increasing the arrival rate of molecules at the nanopore. A lower electrode connected to a source of the transistor is present in the lower part of the trench. Additional metal is deposited onto the oligomer-functionalized nanoparticle to produce a shaped nanoparticle having a morphology based at least in part on the nanoseed morphology and the oligomer’s sequence composition. This allows the flexible circuit electrode array to be both electrode array and surgical tool to cut the retinal and slide the array under the retina in a single action.