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What is the size and shape of single optical photon?


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1 hour ago, martillo said:

Heated filaments have been used as source of particles, photons or electrons, and the heating was attenuated until single events are observed in the experiments but this does not guarantee that a unique atom of the filament has emitted a particle. It is possible that multiple atoms of the filaments emit single particles each but in total many particles could have been emitted quite at the same time producing at the end a group of particles travelling together.

Which would have to happen on each detection. With none if these photons diffracting into different orders and only one of the photons being detected. Thousands of times.

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My limited, chemist's understanding of QM is that you can't really speak of an "objective" EM field configuration for a single photon. If you could, it seems to me it would be a classical object rathe

From those lectures on quantum mechanics that I looked at on YouTube, it follows that the photon has no shape or trajectory. A photon has only two points, where it was born and where it was absorbed.

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

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Posted (edited)
1 hour ago, swansont said:

Which would have to happen on each detection. With none if these photons diffracting into different orders and only one of the photons being detected. Thousands of times.

Yes, some times they diffract producing the observed diffraction patterns. For instance in a double slit experiment if two photons surge in phase, one from each slit, they will interfere at the detector depending in the phase they meet just following the Huygens principle. This perfectly explain the wave-like behavior of photons' particles. What remains is to show how particles exhibit phase. That, I agree, demands a structure for the particles which is the main question asked in this thread, I mean, which would be the shape and size of a photon...

 

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28 minutes ago, swansont said:

Shape and size are not phase, and speculation is not an appropriate response

For instance, if photons could be modeled as "wave-packets", as Duda Jarek has suggested as a possible one, they would exhibit a periodicity and would have phase. But it demands some "E/M structure" for them which unavoidably present shape and size. They could not be modeled as a "point-like" particle or am I wrong in this?

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