To frame this question, we need to assume that time freezes when traveling at the speed of light. This is theoretically congruent with Einstein's theory of relativity and the theory of time dilation, as discussed here: Would time freeze if you could travel at the speed of light?
If this is true, then the photon, which may only exist at the speed of light due to it's "mass-less" property, would not be observable or measurable by any experiment or method that required the passage of time. For the photon's entire existence, the rest of time and existence would not experience change. If the photon traveled 1,000 light years from it's origin in a star to where it was absorbed into some matter, the rest of time and existence would remain changeless for the duration of the photon's 1,000 light year journey. There is no opportunity for anything that experiences the passage of time to observe or measure a photon which never experiences the passage of time.
In the fabric of space time, instead of traveling, the photon stretches. While any other particle not traveling at the speed of light would leave it's point of origin and travel, one point at a time along a path to its destination, it is different for a photon. Instead, a photon could be thought of as being created on all points along a path, including the origin and the destination, simultaneously, and for absolutely no amount of time. Can this be represented with a physics equation?
So if the photon is the light particle and there is also an aspect of light that is known to be an electromagnetic wave form, then the relationship between the two is not that they are the same thing, it is that the photon particle exists before, and causes, the electromagnetic wave form, the way that a boat moving through water causes a wake or lightning through the atmosphere causes thunder.
Is this currently recognized in physics?