Patent ID: 8693823

Claim:
A photonic crystal three-port circulator, comprising: a dielectric background material and a plurality of first air columns symmetrically arranged in the form of triangular lattice in said dielectric background material, wherein, said photonic crystal three-port circulator also comprises a magneto-optical cavity and three waveguides; wherein said photonic crystal three-port circulator further comprises six second air columns; every two said second air columns are arranged at the position in each said waveguide close to said magneto-optical cavity; and the diameter of said second air columns is less than that of said first air columns; said magneto-optical cavity is arranged at the center of said photonic crystal three-port circulator; said three waveguides symmetrically are distributed around said magneto-optical cavity; each of said waveguides comprises a waveguide port arranged at the position in said waveguides far away from said magneto-optical cavity; and said photonic crystal three-port circulator transmits light from any one of said waveguide ports circularly to another next to it in single rotational direction.