Compact Six-Port Photonic Crystal Circulator

A compact six-port PhC circulator, wherein a main body of said six-port PhC circulator is a two-dimensional hexagonal PhC waveguide in a low refractive index background material, said hexagonal PhC waveguide comprises two-dimensional first dielectric material columns which are arranged in forms of triangular lattices, wherein said compact-type six-port PhC circulator comprises a hexagonal PhC branch waveguide and six waveguide ports, said six hexagonal PhC branch waveguides being arranged at a cross-connected position in the center and having a 60° rotational symmetry distribution, said six PhC branch waveguides respectively corresponding to said six waveguide ports, said six waveguide ports being symmetrically distributed at the periphery of PhCs respectively, a second dielectric material column being arranged at the center of said hexagonal PhC waveguide and six identical magneto-optical material columns respectively being arranged at first adjacent positions of said second dielectric material column, six identical third dielectric material columns respectively being arranged at second adjacent positions of said second dielectric material column and an electromagnetic wave signal being inputted from any one of said waveguide ports and being outputted from said next waveguide port adjacent thereto, while the remaining said waveguide ports being in a signal isolated state, thus forming unidirectional circular transmission.