复变量双曲正弦高斯光束在左手材料中的传输

Propagation of Complex Variables Sinh-Gaussian Beams Through a Left-Handed Material

为了研究复变量双曲正弦高斯光束在左手材料中的传输,利用广义惠更斯-菲涅耳衍射积分法,得到复变量双曲正弦高斯光束在左手材料中的传输表达式,并运用此表达式作数值模拟。仿真结果表明,复变量双曲正弦高斯光束的横向光强、光斑尺寸和束腰位置都可以用左手材料的工作频率来调控。当左手材料的工作频率一定时,随着传输距离的增加光斑尺寸先减小后增大;而当工作频率增大时,光强加强,束腰位置越靠近入射面,但发现束腰宽度不受工作频率的调控。

In order to study the propagation of complex variables Sinh-Gaussian beams through a left-handed material, the propagation expressions of complex variables Sinh-Gaussian beams through the left-handed material are deduced by using generalized Huygens-Fresnel diffraction integral for digital simulation. The simulation results show that the transversal in- tensity, spot size and waist position of complex variables Sinh-Gaussian beams can be managed by the operating frequency of left-handed material. When the operating frequency of left-handed material is certain, the spot size firstly decreases and then increases with the increasing of propagation distance. And when the operating frequency of left-handed material increases, the light intensity is strengthened, and the waist position is closer to the incident surface, but the waist width is not con- trolled by operating frequency.