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本文设计了一种球形串型二维表面等离子体光栅光吸收器,采用二维时域有限差分法(2D-FDTD)分析了该吸收器的几何结构参数对其吸收特性的影响。结果表明,通过调整小球的半径、球形串之间的中心距离以及球形串上小球的层数,可以有效地降低反射率,从而提高对光的吸收率。从中心位置向左右两边使球形串之间的中心距离线性减小,可明显改善其吸收效果。当球形串上小球的层数超过50层时,基本达到了饱和吸收的状态。这种光吸收器在薄膜太阳能电池中具有一定的应用前景。
In this paper, a two-dimensional spherical surface plasmon grating optical absorber with spherical shape was designed. The influence of the geometrical parameters of the absorber on the absorption characteristics was analyzed by two-dimensional time-domain finite difference method (2D-FDTD). The results show that the reflectivity can be effectively reduced by adjusting the radius of the ball, the center distance between the ball strings and the number of layers of the ball on the ball string, thereby improving the light absorption rate. From the center to both sides of the ball to the center of the distance between the linear decrease, can significantly improve its absorption effect. When the ball on the ball string of more than 50 layers, basically reached the state of saturated absorption. Such a light absorber has a certain application prospect in a thin film solar cell.