The magneto-optical Kerr effect in magneto-plasmonic arrays Pan He，Shiming Zhou Phys. Dept., Fudan Univ., Shanghai, People’s Republic of China III. Results I. Basic theory The resonant structure can be continuously tuned. Au layer is helpful to enhance the magnitude and reduce the bandwidth Periodic nanostructure The dispersion relation of SP kx  ksp light cone  = c k Diffraction pattern SP overlap with Rayleigh cutoff at the resonant kerr spectra. The resonant structure is sensitive to the refractive index of the dielectric on the surface. : Reciprocal vector The Rayleigh cutoff wavelengths: II. Sample fabrication SEM image of the 2D ordered PS . Doublelayer deposition IV. Conclusion For regularly arranged magneto-plasmonic arrays, a new MOKE feature is found to be located near the Rayleigh cutoff of Wood’s anomaly, in which enhanced MOKE is attainable and Kerr rotation changes sign for narrow spectral band. The spectral position of resonant bands can be continuously tuned by changing the structure parameters. Our findings is helpful to design two-dimensional magneto-optical devices in the visible and IR, such as biosensors. Magneto-optical Kerr spectra Co Au Glass References: 1. P. K. Jain, Y. H. Xiao, R. Walsworth, and A. E. Cohen, Nano Lett. 9, 1644-1650 (2009). 2. A. V. Kabashin, P. Evans, S. Pastkovsky, W. Hendren, G. A.Wurtz, R. Atkinson, R. Pollard, V. A. Podolskiy, and A. V. Zayats, Nature Materials 8, 867-871 (2009) 3. S. Tomita, T. Kato, S. Tsunashima, S. Iwata, M. Fujii, S. Hayashi, Phys. Rev. Lett. 96, 167402 (2006)