A one-dimensional photonic crystal (1DPC), which is a periodic nanostructure with a refractive index distribution along one direction, has been widely studied by scientists. In this review, materials and methods for 1DPC fabrication are summarized. 

The transmission spectrum is for the first sample (without defect layer), which is grown up to the fourteenth layer.

There are ten layers of 1DPCs with different transmission spectra (colors). It's preparation for growing electrodes in Al.