金属纳米结构中分束比宽范围可调的SPP分束器

double-ring plasmonic beam splitter based on metal nanostructures is proposed. The beam splitter is composed of two annular nanowires and three straight nanowires, one annular nanowire is connected to the straight nanowire at the incident end, and the other nanowire is connected to the two straight nanowires at the output end. The annular Surface plasmon polaritons (SPP) excited at the input end formed stable standing waves on the two annular rings, and the field distribution at both ends of the beam splitter was analyzed using the finite difference time domain method. The results show that the existence of standing waves can cause periodic changes in the light intensity at the output end, which can be adjusted by changing the angle between the nanowire at the output end and the line connecting the centers of the two rings, or the angle between the nanowires at the two output ends. The light intensity of the output port. By modifying the parameters, a plasmonic beam splitter with flexible and adjustable beam splittWidely tunable SPP beam splitter in metal nanostructuresing ratio is realized in the communication band, and the designed structure can provide an important component for future optical circuits.