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Robust Chirped Photonic Crystals Created by Controlled Colloidal Diffusion


  • This work was supported by a grant from the Creative Research Initiative Program of the Ministry of Education, Science, and Technology for “Complementary Hybridization of Optical and Fluidic Devices for Integrated Optofluidic Systems.” We thank Dr. Se-Heon Kim at the California Institute of Technology for useful discussions.


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An on-chip spectrometer: Chirped 3D photonic crystals have been created using colloidal particle diffusion in a photocurable medium. The variations in the lattice constant created a color gradient that spanned the entire visible range. By combining the functionality of chirped photonic crystals with a complementary metal-oxide-semiconductor sensor array, a miniaturized spectrometer system is developed (see picture).