Very high efficient of 1x2, 1x4 and 1x8 Y beam splitters based on photonic crystal ring slot cavity

摘要

The main goal of this paper is to design and optimize 1x2, 1x4 and 1x8 Y beam splitters based on a two-dimensional (2-D) photonic crystal operating in the infrared light region of 1550 nm. By altering the Y junction area and using the topology optimization, a very high efficient total transmission of about 100 and equal power distribution of both splitters are achieved. The proposed structures are designed on a hexagonal lattice of air holes immersed in dielectric matrix. These current designs are numerically simulated and analyzed using the plane wave expansion method and finite-difference time-domain method. The total sizes of 1x2, 1 x 4 and 1x8 Y splitters are 60.69 mu m(2), 158.97 mu m(2) and 341.9 mu m(2) respectively, which are extremely compact and they are suitable for photonic integrated circuits.