1

**Physics, Astronomy & Cosmology / What is the size and shape of single optical photon?**

« **on:**30/04/2021 05:23:37 »

Optical photon is produced e.g. during deexcitation of atom, carrying energy, momentum and angular momentum difference.

So how is this energy distributed in space - what is the shape and size of single photon?

Looking for literature, I have found started by Geoffrey Hunter, here is one of articles: "Einstein’s Photon Concept Quantified by the Bohr Model of the Photon" https://arxiv.org/pdf/quant-ph/0506231.pdf

Most importantly, he claims that such single optical photon has

Is it the proper answer?

Are there other reasonable answers, experimental arguments?

Updates: Paper by different author: https://arxiv.org/pdf/1604.03869

Related: https://physics.stackexchange.com/questions/612110/is-it-possible-to-confine-a-photon-in-less-than-its-wavelength

Here is some paper trying to model emission of photon from hydrogen: https://link.springer.com/chapter/10.1007/0-306-48052-2_20

So how is this energy distributed in space - what is the shape and size of single photon?

Looking for literature, I have found started by Geoffrey Hunter, here is one of articles: "Einstein’s Photon Concept Quantified by the Bohr Model of the Photon" https://arxiv.org/pdf/quant-ph/0506231.pdf

Most importantly, he claims that such single optical photon has

**shape similar to elongated ellipsoid of length being wavelength λ, and diameter λ/π**(?), providing reasonably looking arguments:Quote

1) Its length of λ is confirmed by:

– the generation of laser pulses that are just a few periods long;

– for the radiation from an atom to be monochromatic (as observed), the emission must take place within one period [10];

– the sub-picosecond response time of the photoelectric effect [11];

2) The diameter of λ/π is confirmed by:

– he attenuation of direct (undiffracted) transmission of circularly polarized light through slits narrower than λ/π: our own measurements of the effective diameter of microwaves [8,p.166] confirmed this within the experimental error of 0.5%;

– the resolving power of a microscope (with monochromatic light) being “a little less than a third of the wavelength”; λ/π is 5% less than λ/3, [12];

Is it the proper answer?

Are there other reasonable answers, experimental arguments?

Updates: Paper by different author: https://arxiv.org/pdf/1604.03869

Quote

the length of a photon is half of the wave length, and the radius is proportional to square root of the wavelength2021 "The size and shape of single photon" http://dx.doi.org/10.4236/oalib.1107179

Related: https://physics.stackexchange.com/questions/612110/is-it-possible-to-confine-a-photon-in-less-than-its-wavelength

Here is some paper trying to model emission of photon from hydrogen: https://link.springer.com/chapter/10.1007/0-306-48052-2_20