A microelectronic spring contact for making electrical contact between a device and a mating substrate and method of making the same are disclosed. The stabilizing means thus acts as a negative feedback loop and seeks to maintain the overall illumination irradiating the detector, at a substantially constant predetermined level, which tends to linearize and extend the frequency response of the detector to the radiation detected. The binary value-determining level is so determined as not to generate a signal arising from stray light.