Observation of two-dimensional charge transfer in GaAs

The first observation of two-dimensional (x-y) charge tranfer in a GaAs charge coupled device (CCD) is reported. A 32×32 bit 4-phase CCD array with serial read-in and read-out linear multiplexer CCDs was fabricated using Schottky barrier gate technology. Two dimensional charge transfer was verified by optically generating a charge packet in the array and transferring it to the read-out multiplexer. This result demonstrates the feasibility of designing GaAs CCD arrays for signal processing, memory and imaging applications.