▎ 摘　　要

NOVELTY - Graphene optical sensor (1) comprises a set of electrodes formed on a surface of a graphene layer and arranged in a direction parallel to the surface of the graphene layer. The set of plasmonic antennas is provided on the surface between the electrodes (31, 32), where each antenna includes a rod portion extending in another direction inclined from the former direction, where another rod portion extends in a third direction that is opposite to the latter direction, and intersects the former rod portion. The set of the antennas is arranged periodically in the latter and the third directions, where the antennas have a planar shape. USE - Graphene optical sensor used for night vision devices, thermography, etc. ADVANTAGE - The graphene optical sensor is capable of reducing a polarization dependence. The polarization dependence of the optical signal to be detected is reduced. The light absorption efficiency of the plasmonic antennas is improved. The optical sensor can be arranged at an orientation that enables an efficient light detection, in a case where an optical signal is polarized. The amount of light incident to the graphene layer is increased, and thus the amount of the photocurrent is increased. The graphene layer can absorb light over a wide wavelength range from an ultraviolet region to a terahertz region, and can generate electron-hole pairs. The electrons and holes that are generated are collected at the electrodes due to a voltage applied across the electrodes, to form a photocurrent, by measuring a change in an amount of photocurrent. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of graphene optical sensor. 1Graphene optical sensor 31First electrode 32Second electrode 41Multiple first rod portions 42Second rod portion