> the wave nature of light introduces interesting artifacts the smaller your pixels get The particle nature as well. Because light arrival is a poisson process

> the wave nature of light introduces interesting artifacts the smaller your pixels get The particle nature as well. Because light arrival is a poisson process, your pixels need to be big enough that their “backing capacitor”, so to speak, can fit at least a few tens of thousands of electrons for acceptable noise levels. If your pixel capacitor maxes out at 100 electrons, your SNR will never exceed 10, even under optimal conditions (or, at least, you have to downscale, and then you would be better off with bigger pixels in the first place).