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MIT Photonic-Bands Package: A free downloadable program for computing the photonic band structures (dispersion relations) and electromagnetic modes of periodic dielectric structures, and is applicable both to photonic crystals (photonic band-gap materials) and a wide range of other optical problems. It was developed by Steven G. Johnson at MIT in the Joannopoulos Ab Initio Physics group [http://ab-initio.
Tape casting may be especially useful in controlling the volume percentage and distribution of nanocrystals within a slip preparation. By experimenting with these variables, developers can directly observe property changes in the final product. In addition, the orientation of particles within a cast tape will be affected by the type of casting head used, as well as the kinds and volume percentages of plasticizers or other materials in the slip. These are also variables that can easily be changed in the tape casting process while providing useful feedback to the developer. Photonic crystals, or photonic band gap materials.