|
| 具有精细结构的圆对称爱里光束的传输特性研究 |
| Propagation characteristics of the circular Airy beam with fine structures |
| 投稿时间：2018-08-31 |
| DOI：10.3969/j.issn.1005-5630.2019.04.008 |
| 中文关键词: 圆对称爱里光束 精细结构 衍射理论 突然自聚焦 |
| 英文关键词:circular Airy beam fine structure diffraction theory abruptly autofocusing |
| 基金项目:国家重点基础研究发展计划（973计划）（2015CB352001）；国家自然科学基金（61008044）；上海市自然科学基金（16ZR144600） |
|
| 摘要点击次数: 2867 |
| 全文下载次数: 2083 |
| 中文摘要: |
| 为了研究具有精细结构的圆对称爱里光束的传输特性，通过减小与光斑宽度相关的参数w，使初始光场具有与波长相近的精细结构。在此特定情况下，用瑞利-索末菲衍射理论对圆对称爱里光束的传输特性进行数值计算。研究结果表明：随着参数w的减小，圆对称爱里光束的精细结构增加，使得代表高频成分的离轴光场影响逐渐增大并参与聚焦行为，焦点光强峰值增大，焦点主光斑的半高全宽减小，突然自聚焦能力得到显著提升；当w减小到某一阈值后，由于持续增加的高频分量进入到倏逝波，焦点光强峰值减小，焦点主光斑的半高全宽增大，突然自聚焦性能下降。 |
| 英文摘要: |
| The circular Airy beam is a type of autofocusing waves. The unique property of the circular Airy beam is that this beam can maintain quite low intensity profiles before the focal point and the maximum intensity of the beam can abruptly increase by orders of magnitude just at the focal point. The fine structures of the beam can be obtained by decreasing w. In this paper, firstly, the Fresnel, the Fresnel-Kirchhoff and the Rayleigh-Sommerfeld diffraction theories were compared. It found that the Rayleigh-Sommerfeld diffraction theory was the most suitable method. Then, the propagation characteristics of the circular Airy beam with fine structures were studied in detail by using the Rayleigh-Sommerfeld diffraction theory. The results showed that the nonparaxial components of the field would increase as w decreases. At beginning, the increasing nonparaxial components enhanced the autofocus, resulting in an enhancement of the peak intensity and a decreasing of the full width at half-maximum at the focus. However, as w further decrease and beyond a certain value, more and more nonparaxial components became evanescent wave, and could not propagate to far field. The peak intensity at the focus decreased sharply. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
