disclosed is a detector array for sensing electromagnetic radiation , which is based upon a semiconducting layer of a first conductivity type with an array of junction regions of a second conductivity type located in a major surface thereof . a first insulating layer is deposited over the major surface , and a plurality of conducting plates is disposed on the first insulating layer around each junction region . each conducting plate creates an induced junction in the semiconducting layer upon the application of an electrical potential between the plate and the semiconducting layer . a second insulating layer is deposited over the plates and the first insulating layer , with a contact through the first and second insulating layers associated with each junction region . each conducting plate is connected to a control line deposited over the second insulating layer for selectively applying the potential to that plate . a third insulating layer is deposited over the device , with an opening through that layer to each of the contacts .