The EM polarizing structure contains a two dimensional planar variation structure, having medium nodes regularly distributed as a two dimensional planar photonic unit lattice cell array on a plane. Each of the photonic unit lattice cells has an operation axis and is identical at each lattice point, which passes a diagonal of photonic unit lattice cell. The medium nodes within each planar photonic unit lattice cell are distributed asymmetrical with respect to the operation axis direction and identical at each lattice point. The EM polarizing structure is used to modulate an input EM wave around an operation frequency of the photonic band associated with the EM wave polarizing structure. Thus a corresponding output EM wave becomes polarized. Moreover, the EM wave polarizing structure can be integrated with an EM wave emitting source. Thus an output EM wave from the device is polarized.