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We report on the coupling and interaction between the fundamental resonances of planar metamaterials (split ring resonators) and intersubband transitions in GaAs/AlGaAs quantum wells structures in the mid-infrared. An incident field polarized parallel to the sample surface is converted by the metamaterial resonators into a field with a finite component polarized normal to the surface and interacts strongly with the large dipole moment associated with quantum well intersubband transitions.