I have read this question where anna v says:
The photon is an elementary particle in the standard model of particle physics. It does not have a wavelength.
And this one where Emilio Pisanty says:
Photon frequency and wavelength are the same as the corresponding classical mode. If the state of the field is such that there is, whenever you look, only one excitation present, then we say the field is in a single-mode, single photon state. This photon then has a well-defined frequency (ν=ω/2π) and wavelength (λ=2π/k).
And if you look on this site, you find numerous occasions where people talk about the wavelength of a single photon.
Naively, I would think that a photon does have energy, and frequency associated with it, and since frequency and wavelength are inversely related (in vacuum), even a single photon could have a wavelength too. But if I interpret it as a point particle defined in the standard model, then the meaning of wavelength is not so obvious.
- Does a single photon have a wavelength or not?