Photonic band structure of the SIO in air (blue) and acetone
(red) calculated using the plane-wave expansion method. The refractive indices used in the simulation were 1.54 for silk, 1.00 for air and 1.36 for acetone.
The unshifted and shifted pPBG are highlighted in the figures. Frequency-domain reflectance spectra for the SIO with lattice constant L ¼ 300 nm are
plotted on the right to compare with the band structure