I have no idea really, but the above explanation implies reminds me on the double slit experiments. Also, inference is additive in the amplitude, but phase shifts much smaller than the wavelengths are used in interferometers to measure layer depths.
I believe it’s mostly single slit and diffraction, light can pass through holes smaller than its wavelength but even that isn’t needed just yet, nanophotonics will be the next step tho.
http://web.eecs.utk.edu/~jaynewu/Teaching/resolution.pdf