The quantization of the electromagnetic field in vacuum is presented without reference to lagrangean quantum field theory. The equal time commutators of the fields are calculated from basic principles. A physical discussion of the commutators suggest that the electromagnetic fields are macroscopic emergent properties of more fundamental physical system: the photons.
Understanding light quanta:Construction of the free electromagnetic field
Understanding light quanta: The Photon
There is no first quantization - except in the de Broglie-Bohm interpretation
