由于光在不同长度的波导中传输时出现不同的相位延迟，特定的波导阵列可以对光波波阵面进行调制。通过理论推导发现左右两边带有凸出三角形的波导阵列结构可以实现光波场的聚焦。利用时域有限差分法模拟了左右两边带有凸出三角形的波导阵列对光波的聚焦情况，找出在波导厚度h=6000 nm，波导长度差d=100 nm，波导数目m=10，波导宽度w=100 nm时聚焦效果最好，同时通过研究不同参数对该结构的聚焦特性的影响，找出该结构具有利用价值的性质。此外，通过模拟发现前凹三角形金属波导阵列结构在波导宽度w2=80 nm，中央波导宽度w1=150 nm，波导长度差d=200 nm，波导厚度h=4400 nm，波导数目m=8时能实现光波场的分束。

Due to the difference in phase delay of light wave propagating through waveguides with different lengths, wave front can be modulated by waveguide array. Based on theoretical derivation, it is found that metal waveguide array with convex triangle in left and right sides can focus light wave. Using the finite-difference time-domain method, the focusing in metal waveguide array with convex triangle in left and right sides is simulated. It is found that when the thickness of waveguide h=6000 nm, the difference in waveguide length d=100 nm, the waveguide number m=10, and the waveguide width w=100 nm, the metal waveguide array has better focusing performance. Some valuable characteristics of such a structure are also found by investigating the of different framework parameters on its focusing properties. Simulations also indicate that when the waveguide width w2=80 nm, the central waveguide width w1=150 nm, the difference in waveguide length d=200 nm, the thickness of the waveguide h=4400 nm, and the waveguide number m=8, the concave triangular waveguide array can realize beam splitting.