Is there a limit to the amount of energy that can be stored in a single photon?

Answer 1

E=hv
E- energy
h - Planck's constant
v - frequency

It seems that photon's energy is directly proportional to its frequency. The question then becomes is there a limit to the frequency of photon existence. Gamma-rays have the most energetic photons.

Finally
Since frequency = speed of light over wavelength and
"The smallest wavelength possible (a very small gamma ray) is around 100 fm (a femtometer is 1E-15 m) "(see ref 3) you have your answer.

Answer 2

There is no question of storing energy in a photon ,as, for example the way,energy can be stored in a capacitor or a mechanical spring etc. At a given frequency 'f' , energy 'E' is carried as a discrete quantum referred to as photon and this discrete energy 'E ' is given by the following relation to the emitted frequency 'f' as E = h * f , where h is Plank's Constant equal to 6.626 068 * 10^(-34) Joules. Sec.

This means that a Photon has a particular value of energy at a given frequency (or wavelength), nothing more - nothing less.
You may ask which is the photon that has maximum energy known to us , the greater the frequency , the greater the energy ( perhaps Gama rays).

Answer 3

It seems not. A photon is a dualistic wave/particle which has mass at the speed of light. The shorter the wavelength, the bigger the mass. Cosmic rays are really high energy photons and some are so energetic that scientists are working on theories as to how they got that way.