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What's the smallest aperture a photon can pass through? I mean with no transmission at all. … If so, can we say that the size of the aperture can be associated with the dimension of the photon? …

Is there any size of photon if so what is it? And also which particle had smallest size / radius / volume considering all of the matter. …

Does the wavelength of photon affect its size, as when the wavelength is big the photon has big size and it small it has small size? … thus it will have a big size, is there any relation between the wavelength and the size of both electron and photon ? …

I have read that photon "size" is proportion to wavelength, but I've also read that photon "size" isn't exactly a thing. … So does this mean that different colors, which have different wavelengths and thus different "size" photons, will leave different size marks on a light sensitive screen when fired? …

Does a photon have any measurable size as a "particle"? If we determine its exact location and take away all motion in an isolated static environment, how large is it? Is it sub-Planck in size? … If there is no motion in this static environment, is the photon also sub-Planck in terms of time? …

Does photon have size measurement because of its particle nature like electron's 3.86*10^-13m etc.. …

So how is this electromagnetic energy distributed in space (rho~|E|^2+|B|^2) - what is the shape and size of a single photon? What is the position distortion of such wavepacket? … Update: 2021 "The size and shape of single-photon" http://dx.doi.org/10.4236/oalib.1107179 Attosecond chronoscopy brings hope to verify e.g. photon models experimentally - gathered: https://scholar.google.pl …

How "wide" is a photon, if any, of its electromagnetic fields? Is there any physical length measurement of these two orthogonal fields, $E$ and $M$, from the axis of travel? … When a photon hits a surface, and is absorbed by an electron orbital, this width comes into play, as there could have been more than one electron that could have absorbed the photon? …

What is the contraction ratio in the dimensions along the axis of travel between a static observer and a photon passing by? …

Does a photon with a large wavelength have a wider probability distribution with regard to where it can be expected to be detected? …

I am wondering whether a black hole can absorb photons whose wavelengths are greater than the horizon size of the black hole. I have seen different contradicting opinions on the answer. … "A single photon" requires knowing how to quantize the EM field near a black hole. That is an open problem. And also, "single" particles don't objectively exist in accelerated frames. …

https://arxiv.org/ftp/arxiv/papers/1604/1604.03869.pdf "Substituting Eq. (19) into Eq. (6) gives the photon radius ... (20) where re is the classical radius of an electron. … Since the length of a photon is equal to half of the wavelength and the radius is proportional to square root of the wavelength, the size and shape of a photon vary with the photon energy or wavelength …

v=hv12oB_uyFs When firing photons or electrons at a light sensitive sheet (or whatever types of detectors are used), whether directly or through a double slit, does the size and density of the marks the … Or is the size/density/intensity the same regardless of distance - 1 foot, 10 feet, a mile, etc.? …

I mean the maximum value of the sinusoid for a single photon. I have read about this some where, but no idea where. … A photon has a well defined energy and wavelength and they can come as single particle. So i just wondered how one photon would induce a magnetic field. …

Therefore, wouldn't it be possible to have particles of any conceivable size, provided the energy, couldn't you have a photon the size of a building? … Or one unimaginably smaller than the accepted size of a photon? Am I missing something, or is this one of those unanswered questions that linger in physics? …