Inside Cover: Robust Chirped Photonic Crystals Created by Controlled Colloidal Diffusion (Angew. Chem. Int. Ed. 49/2011)



original image

An on-chip spectrometer has been developed using chirped 3D photonic crystals mounted on a complementary metal-oxide-semiconductor sensor array. In their Communication on page 11 649 ff., S.-H. Kim, S.-M. Yang, and co-workers show that colloidal diffusion in a photocurable medium created gradual variations in the lattice constant of the colloidal crystals. The variations in the lattice constant resulted in a color gradient that spanned the entire visible range.