Diodes capable of rectifying AC at infrared frequencies could potentially be applied in frequency mixers for infrared communications and data multiplexing. However, nanoscaled thermionic diodes are not suitable for this purpose due to their design limitations, including the heating of both electrodes and issues with transit time. While the idea of designing such diodes raises questions about potential breakthroughs, experts suggest that significant progress is unlikely. Alternative methods using optics or optoelectronics already exist for similar applications. Overall, the current technology landscape does not favor the development of infrared rectifying diodes.