OPTICAL MODEM DEVICE

摘要

PROBLEM TO BE SOLVED: To improve modulation/demodulation efficiency of an optical modem device that operates in a terahertz frequency region using graphene.SOLUTION: An optical modem device comprises: an optical waveguide; a graphene double layer including an insulating film interposed between a first graphene layer and a second graphene layer; a first metal electrode connected to one end of the first graphene layer; and a second metal electrode connected to one end of the second graphene layer. At least one of the first graphene layer and the second graphene layer is arranged so that photoexcited carriers are generated by an electric field of propagation light in the optical waveguide. The insulating film is composed of a material that injects the photoexcited carriers generated by the at least one of the first graphene layer and the second graphene layer through the insulating film into the other.