Abstract
Reciprocity in optics-the invariance of a light-matter interaction to the reversal of time-is a key principle in electrodynamics. This symmetry can be broken in the presence of magnetization, making the light propagation along forward and backward directions no longer invariant. Magneto-optical polarization rotation in the Faraday effect is a prominent example of this broken symmetry in optics.
© 2013 Optical Society of America
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