Figure 2
From: Dispersion engineering with plasmonic nano structures for enhanced surface plasmon resonance sensing

(a) Calculated reflectivity as a function of wavelength at a fixed incidence angle for conventional and plasmonic nanograting based Kretschmann configuration respectively. Electric field distribution for (b) conventional and (c) plasmonic nanograting based Kretschmann configuration. The different zoom in scale has been used for both the field plots for visualization purpose. Scale bar is arbitrary but similar normalization was applied for both panels b and c.