Effect of rotational randomness on focusing in a two-dimensional photonic-crystal flat lens

被引：10
|
作者：
Feng, Zhifang [1 ]
Zhang, Xiangdong
Feng, Shuai
Ren, Kun
Li, Zhi-Yuan
Cheng, Bingying
Zhang, Daozhong
机构：
[1] Beijing Univ Chem Technol, Beijing 100029, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[3] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
来源：
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2007年 / 9卷 / 01期
关键词：
negative refraction; lens; photonic crystal;
D O I：
10.1088/1464-4258/9/1/017
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Rotating the basic unit randomly is an important method for the transformation from periodical structures to disordered systems. In this work, we investigate in detail the influence of rotational randomness and surface modification on focusing of electromagnetic waves in a two-dimensional photonic-crystal flat lens by the finite-difference time-domain method and experimental measurements. We have found that focusing can appear within a large range of random rotation angles although the quality degrades with the increase of the rotation angle randomness. When the degree of randomness goes beyond a certain value (30 degrees), the focusing effect disappears. However, it is interesting that focusing can reappear with the modification of the surface of the random lens.
引用
收藏
页码：101 / 107
页数：7
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