Classical $v_{gr} \neq c$ solutions of Maxwell equations and the   tunneling photon effect
  We propose a very simple but general method to construct solutions of Maxwell equations propagating with a group velocity $v_{gr} \neq c$. Applications to wave guides and a possible description of the known experimental evidences on photonic tunneling are discussed. 
S. Esposito (I.N.F.N. Sezione di Napoli)