Physicists Build Diode for Electromagnetic Waves - Technology Review: The mathematics of electromagnetic wave propagation suggests that certain types of material should allow polarized waves to pass in one direction but not the other when bathed in a magnetic field. Engineers can readily build such a device but its effect is what physicists call linear, meaning that the amount of light you get out is proportional to the mount you put in...
A microwave passing through wires generates currents in each that tend to interact. At certain frequencies these currents re-reinforce or cancel out. Adding a nonlinear diode to one of the wires makes the effect of the metamolecule nonlinear too.
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