Optoelectronic NAND- and NOR-type logical gates
Z. Porada, Elzbieta Schabowska-Osiowska · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
Optoelectronic logical gates NAND and NOR are composed of thin film photoconducting and electroluminescent elements, made of cadmium sulphide and zinc sulphide respectively, doped with copper, chlorine and manganese. These gates consist of several photoconducting elements and one electroluminescent element connected in series or parallel, supplied with a sinusoidal voltage. In such a circuit the function of logical product or logical sum for input light signals illuminating the photoconducting elements is realized, and the output signal is the light emitted by the electroluminescent element. This output signal illuminates in turn the next photoconducting element being present in the second circuit, in which the NOT function is realized.