Plasmon assisted transmission of high dimensional orbital angular   momentum entangled state
  We present an experimental evidence that high dimensional orbital angular momentum entanglement of a pair of photons can be survived after a photon-plasmon-photon conversion. The information of spatial modes can be coherently transmitted by surface plasmons. This experiment primarily studies the high dimensional entangled systems based on surface plasmon with subwavelength structures. It maybe useful in the investigation of spatial mode properties of surface plasmon assisted transmission through subwavelength hole arrays. 
Xi-Feng Ren, Guo-Ping Guo, Yun-Feng Huang, Chuan-Feng Li, Guang-Can   Guo