Electromagnetic energy density profiles of the SHP and AHP waveguides. The profiles are SHP waveguides (a) in air and (b) on a silica substrate, and (c) AHP waveguides on silica substrate. (d, e, f) Corresponding normalized electromagnetic energy densities along the Y-axis (from 0 to 0.6 μm) are shown.
Wei et al. Nanoscale Research Letters 2014 9:13 doi:10.1186/1556-276X-9-13