The present invention relates to a method of producing aromatic amines by hydrogenation of aromatic nitro compounds. The sensor comprises first and second optically active units, where energy may be transferred from an excited state of the first optically active unit to the second optically active unit. A first current on the radiating element induces a second current on the ground plane proximate the isolated conductive structure thereby inducing a third current on the isolated conductive structure opposing the second current wherein the third current creates an electromagnetic field.