The tuning of the spectral and directional radiation properties can be applied in manyapplications, such as thermal imaging, solar thermal and solar cells. Electromagneticradiation from micro-structured surface, however, usually divides into differentwavelengths and angles, which makes the research urgent. Among all the microstructures,1-D gratings are widely used for their good performance and easy fabrication. This thesisconsiders the1-D gratings radiation properties with the help of FDTD method and thegr...