amplification of absorption induced by localized surface plasmons in superconducting nanowire single-photon detector

The absorption can be amplified by using tungsten silicide (wsi) and metallic nano-antennas, which is related with the detection efficiency of a superconducting nanowire single-photon detector based on surface plasmons. a metal slot sandwiched between two hydrogen silsequioxane (hsq), wsi nanowire, and metallic fan nano-antennas are the elements of the proposed single-photon detector. the slot is also filled with hsq and wsi nanowire is inserted in the top of the slot. metallic fan nano-antennas are added no wsi nanowire and the all these elements are deposed on the sapphire substrate. our results show that the absorption/the detection efficiency of our proposed structure is much larger than the one with the niobium nitride (nbn) nanowire. there is an optimal width of wsi nanowire and the distance between wsi nanowire and metallic nano-antennas for the absorption/the detection efficiency of the detector. our structure provides suitable parameters for designing snspd in experiments.