Manipulation of light using slanted layer photonic crystals in holographic gelatin emulsions

We use slanted layer structures fabricated in holographic gelatin emulsions using a two-beam optical interference to bend light in the bandgap of the layer structures. We demonstrate that light in the visible range, incident normal to the holographic emulsion plate, can be bent so that it is trapped inside the gelatin emulsion by internal reflections and comes out at the edges of the plate using a single-slanted-layer structure. Furthermore, we show that using a double-slanted-layer structure, consisting of two single-slanted-layer structures arranged in a V-shaped configuration, light in the bandgap can make a U-turn inside the gelatin emulsion and come out of the emulsion like a reflection but with the beam displaced from the incident beam by the separation of the two slanted layers. The slanted layer structures may be applicable in steering light in optical circuits and couplers.