Faraday effect enhancement in Co-ferrite layer incorporated into one-dimensional photonic crystal working as a Fabry-Perot resonator

We fabricated a one-dimensional magnetophotonic crystal (MPC), in which a m agnetic layer of Co-ferrite (similar to 40 nm in thickness) is sandwiched b y a couple of dielectric multilayer reflectors with (SiO2/TiO2)x7 structure . The Co-ferrite layer was synthesized by ferrite plating from aqueous solu tion at 90 degrees C. The MPC is so designed to enhance magneto-optical Far aday rotation theta(F) at the Fabry-Perot resonance wavelength lambda of th e multilayer structure. theta(F) was observed to increase by factor of simi lar to 5.4, but at lambda=similar to 620 nm which is deviated from the targ et resonance (lambda=740 nm) and at very weak transmissivity. This may be b ecause the Co-ferrite layer is rough in surface and smaller in thickness th an the target thickness at which Fabry-Perot resonance is designed to occur . (C) 2000 American Institute of Physics. [S0021-8979(00)27208-3].