I have found closely related questions on StackExchange, but (surprisingly) not this exact question. Seems some answers say individual photons do not have amplitude, only when traveling with other photons, forming a wave. But even then, can't the amplitude be measured? If so, what are the range of amplitudes and how do they vary? Based on the frequencies and energies of the light? Does higher frequency correspond to lower amplitude?
Moderators: This question is not a duplicate to this question: Amplitude of an electromagnetic wave containing a single photon
That prior question is more about the formula for calculating electromagnetic energy amplitude of a single photon. My question is about an experimental way to MEASURE the positional (x) amplitude of the wave passing through a specific apparatus. Two very different things. Thanks.
I have updated my question to a more specific thought experiment:
If you had a vertical slit with a horizontal width that could be varied, and you passed horizontally polarized light through this slit, wouldn't the slit block any photons from passing through it if the width of the slit was smaller than the amplitude of the light waves?
Wouldn't we at least get a predicted or average amplitude, even with uncertainty principle?
Wouldn't the energy/frequency/wavelength of the wave also have some correlation to the amplitude?