Light field distribution of general function photonic crystals
  In this paper, We have presented a new general function photonic crystals (GFPCs), which refractive indexes are line functions of space position in two mediums $A$ and $B$, and obtain new results: (1) when the line function of refractive indexes is up or down, the transmissivity can be far larger or smaller than 1. (2) when the refractive indexes function increase or decrease along the direction of incident light, the light intensity should be magnified or weaken, which can be made optical magnifier or attenuator. (3) The GFPCs can be made optical diode when the light positive and negative incident the GFPCs. 
Xiang-Yao Wu, Bo-Jun Zhang, Xiao-Jing Liu, Si-Qi Zhang, Jing Wang, Nuo   Ba, Li Xiao and Hong Li
physics.optics