It is well established that for a reduction of clutter and enhancement of desired features/contrast, one will require the use of multispectral focal plane arrays. These arrays will be highly beneficial for a variety of applications such as missile warning and guidance, precision strike, overhead surveillance, target detection, recognition, acquisition and tracking, thermal imaging, navigational aids and night vision, etc. Currently a common approach for the fabrication of multispectral arrays is via epitaxial deposition of layers of mercury cadmium telluride of different compositions on top of each other. Here we start with a bulk wafer of mercury cadmium telluride with a composition that is suitable for the detection of one of the required wavelengths. Next, the compositions suitable for the detection of other wavelengths are achieved via selective deposition and diffusion of CdTe or HgTe. Thus the individual detector elements corresponding to the different colors lie in the same plane and not on top of each other. These can now be interfaced to simple multiplexers, rather than those with switching capabilities. Additional advantages include improvements in cost and producibility.