Focusing and phase compensation of paraxial beams by a left-handed material slab
- 作者：Hailu Luo ; Wei Hu ; Zhongzhou Ren ; Weixing Shu and Fei Li
- 关键词：Left-handed material ; Paraxial beams ; Beam focusing ; Phase compensation
- 刊名：Optics Communications
- 出版年：2006
- 期刊代码：50_00304018
- 类别：ph
- 出版时间：1 October 2006
- 卷：266
- 期：1
- 页码：327-331
- 文件大小：226 K
摘要
On the basis of angular spectrum representation, a formalism describing paraxial beams propagating through an isotropic left-handed material (LHM) slab is presented. The treatment allows us to introduce the ideas of beam focusing and phase compensation by LHM slab. Because of the negative refractive index of LHM slab, the inverse Gouy phase shift and the negative Rayleigh length of paraxial Gaussian beam are proposed. It is shown that the phase difference caused by the Gouy phase shift in right-handed material (RHM) can be compensated by that caused by the inverse Gouy phase shift in LHM. If certain matching conditions are satisfied, the intensity and phase distributions at object plane can be completely reconstructed at the image plane.