1. A device for imaging a microwave magnetic field polarization component (B − , B π , B + ) of a microwave relative to a static magnetic field (B 0 ), comprising: a preparation means being designed to prepare an atomic vapor comprising a plurality of thermal atoms in a first hyperfine state, particularly a dark state to applied laser light, which first hyperfine state is energetically split from other hyperfine states due to the zero-field hyperfine splitting and/or due to a static magnetic field (B 0 ) generated by said preparation means, such that said microwave whose magnetic field polarization component (B − , B π , B + ) is to be imaged is able to drive Rabi oscillations of said plurality of thermal atoms between said first hyperfine state and a second hyperfine state with a Rabi frequency (ω i (r)) that is proportional to said magnetic field polarization component (B − , B π , B + ), at least one cell enclosing said plurality of thermal atoms, and an imaging means being designed to capture a state image in at least one of the hyperfine states of said plurality of atoms representing the spatial atomic density distribution (N e ) being a function of the Rabi frequency (ω i (r)) of said Rabi oscillations.