Realizing mode conversion and optical diode effect by coupling photonic crystal waveguides with cavity

Ye Han†,‡^a), Zhang Jin-Qian-Nan^a)‡, Yu Zhong-Yuan^a), Wang Dong-Lin^b), Chen Zhi-Hui^c)

Schematic diagram of the proposed two-dimensional PhC mode converter and optical diode. The structure can be divided into five parts (from left to right): W2 waveguide, matching stage, W1 waveguide, L2 cavity, and W2 waveguide. PhC is based on silicon rods ( ε = 12) in air.