▎ 摘　　要

NOVELTY - The utility model claims a graphene layer interval of silver nanometer particle LSPR U-shaped optical fibre sensor, comprising a U-shaped optical fibre; said U-shaped fibre is one shape is U-shaped optical fibre bent section of middle part of the U-shaped optical fibre into a curved shape, and the rest part is a linear section, a straight line section comprises a linear section of fibre core and cladding of linear section, linear section cladding coated straight section core, core surface bending section includes a curved segment core, the bending section set in turn at least 3 layer of sensitive film from inside to outside; each sensitive film is silver nanometer particle layer and a graphene layer from inside to outside in turn. The utility model uses the graphene increase of silver nanometer particle electromagnetic coupling between silver nanometer particle layer, thereby enhancing the LSPR and improve the sensitivity.