Interference peak ordinal vs. the inverse of the peak wavelength obtained from the data of Figure4. Blue triangles refer to the empty PSi layer and red circles to the eumelanin-impregnated PSi layer. The linear fits of the experimental data are also shown for the lower (right) and higher (left) energy sides of the explored spectral range.
Mula et al. Nanoscale Research Letters 2012 7:377 doi:10.1186/1556-276X-7-377