▎ 摘　　要

NOVELTY - The optical sensor (1) has a graphene layer (13) which comprises a first main surface (13A) to be irradiated with light and a second main surface (13B) set opposite to the first main surface. A first plasmon antenna (11) is arranged on the first main surface. A second plasmon antenna (12) is arranged on the second main surface. The second area of the second plasmon antenna is smaller than the first area of the first plasmon antenna in a plan view from a direction perpendicular to the first main surface. USE - Optical sensor. ADVANTAGE - The optical sensor comprises a graphene layer that is provided with a graphene main surface, and thus improves the sensitivity of the optical sensor. DESCRIPTION OF DRAWING(S) - The drawings show the top and sectional views of a optical sensor. (Drawing includes non-English language text) Optical sensor (1) Plasmon antennas (11,12) Graphene layer (13) Main surfaces (13A,13B) Electrode (33)