(a) Faraday rotation by a magneto-plasmonic photonic crystal for the TM-polarised incident light, where φ is the Faraday rotation angle. At normal incidence, TM-polarised light has the electric field perpendicular to the gold wires; (b) Schematic of the magneto-optical photonic crystal, where the BIG film (dark red) is deposited on a glass substrate (blue) and the periodic gold nanowire structure is sitting atop; (c) A scanning electron microscopy image of one of the investigated hybrid structures; (d) Measured Faraday rotation of the three samples at normal incidence (TM polarization), compared with measured Faraday rotation of the bare BIG film; (e) Measured transmittance of the three samples at normal incidence (TM polarization). Reprinted from [44] with permission by Macmillan Publishers Ltd, Copyright 2013.