A number of interesting facts/data came to mind when I saw this question. [1] Scientific theories are models we use based on known data...[2] The dual nature of light/photons...[3] the fact that light/photons have no rest mass...a photon is a quanta of light or a bundle of the smallest amount of energy we can measure.
Considering all that data, I came to the average sensible lay person's conclusion that a photon would have no shape. But like any good sensible lay person, I did some checking...https://physicsworld.com/a/how-to-shape-photons-using-a-trapped-atom/#:~:text=A photon is a quantum,photon's temporal shape or mode.
"A photon is a quantum of light that can be described as a packet of waves that travel through space. A photon’s wavefunction is spread out over time and the specific nature of that distribution is the photon’s temporal shape or mode".
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then this.....https://cosmosmagazine.com/physics/what-shape-is-a-photon/
What shape are photons? Holography sheds light:
Hologram of a single photon reconstructed from raw measurements (left) and theoretically predicted (right). Credit: FUW
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https://www.mat.univie.ac.at/~neum/physfaq/topics/shape.html
The shape of photons and electrons:
extract:
"A free photon can have the shape of an arbitrary solution of Maxwell's equation in vacuum. But only very special solutions are controllable and hence useful for experiments or applications.
Upon production in a laser, photons are more or less localized (not precisely, this is impossible, as photons cannot have an exact position, due to the lack of a unique position operator with commuting coordinates); often only in the transversal direction of the beam - then you don't know where it is in the beam, except probabilistically.
For photons on demand (that you can program to transmit information) you need to know when and where you transmit the photon, so it must be well-localized.
Of course, a slit or a half-silvered mirror delocalizes a photon, and only a measurement (or decoherence along the way) relocalizes it. This enables interference effects. In these cases, the photon stops being particle-like and behaves just like an arbitrary excitation of the e/m field, i.e., like a wave.
The particle picture of light is good only in the approximation where geometric optics is applicable. This has been known for almost 200 years now.
The paradoxes and the alleged queerness of quantum theory both have their origin in misguided attempts to insist on a particle picture where it cannot be justified"
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Hope that helps............