▎ 摘　　要

NOVELTY - The sensor unit has a metal film (1) located at a bottom portion. A medium layer (2) is located above the metal film. A graphene layer (3) is located above the medium layer. Thickness of the metal film is greater than 20 times of a skin depth of a metal skin. The graphene layer is provided with an etching pattern for forming an absorption peak. Adjacent layers are jointed with each other. A geometric center is fixed on a straight line. USE - Ultra-surface local plasmon sensor unit for forming an ultra-surface local plasmon sensor (claimed). ADVANTAGE - The sensor unit uses simple geometric pattern graphene ultra-surface, realizes multi-band, tunable, high sensitivity and high quality factor of plasmon sensor, and ensures better absorption performance when the light source is incident at a large angle. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of an ultra-surface local plasmon sensor unit. 1Metal film 2Medium layer 3Graphene layer