Building Nanocrystalline Planar Defects within Self-Assembled Photonic Crystals by Spin-Coating


  • This work has been funded by Fundación Ramón Areces. We thank F. Varela for his help during SEM characterization.


original image

A new type of 2D defect within artificial opals is presented. Sequential deposition of a colloidal crystal by convective self-assembly and a slab of oxide nanocrystals by spin-coating gives rise to heterostructures (as shown in the figure). The nanocrystalline layer behaves as an optical dopant, opening transmission windows within the forbidden frequency interval of the lattice, as can be seen in the superimposed transmittance spectra.