On the photon theory of L. de Broglie

The photon theory initiated by L. de Broglie some forty years ago contains several characteristic features, the most important of which are reviewed in this paper: a representation of the photon wave function through a bispinor, its wave equation, the annihilated state, and three points which still raise interesting questions i.e. complex electromagnetic fields for elementary phenomena, non-maxwellian tensor densities and a massive photon. (Auth.)