Wavelength selection all-optical switch based on surface plasmon polaritons

The invention discloses a wavelength selection all-optical switch based on surface plasmon polaritons, and belongs to the technical field of micro-nano photoelectrons. The wavelength selection all-optical switch is composed of a substrate layer and a rectangular metal layer, the rectangular metal layer is tightly attached to the upper portion of the substrate layer, and a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide and an equilateral triangle resonant cavity which are equal to the rectangular metal layer in height are etched on the rectangular metal layer, the second straight waveguide and the fourth straight waveguide are the same as the long side direction of the rectangular metal layer; included angles between the first straight waveguide and the long side direction of the rectangular metal layer and between the third straight waveguide and the long side direction of the rectangular metal layer are 60 degrees; a rectangular metal block whic