Electromagnetic energy flow lines as possible paths of photons
  Motivated by recent experiments where interference patterns behind a grating are obtained by accumulating single photon events, here we provide an electromagnetic energy flow-line description to explain the emergence of such patterns. We find and discuss an analogy between the equation describing these energy flow lines and the equation of Bohmian trajectories used to describe the motion of massive particles. 
M. Davidovic, A. S. Sanz, D. Arsenovic, M. Bozic, S. Miret-Artes