Annular arrayed-waveguide fiber for autofocusing Airy-like beams.
Annular arrayed-waveguide fiber for autofocusing Airy-like beams.
复制标题
DOI：
10.1364/ol.41.000824
复制
发表时间：
2016-02
期刊：
影响因子：
3.6
通讯作者：
Hongchang Deng;Yonggui Yuan;Libo Yuan
中科院分区：
文献类型：
--
作者：
Hongchang Deng;Yonggui Yuan;Libo Yuan
我们提出并从理论上证明了一种新型的光纤与环形阵列波导实现艾里相位和振幅调制，并产生突然自聚焦圆形艾里光束。利用耦合模理论和角谱方法研究了光在艾里光纤和自由空间中的传播特性。计算结果表明，这种光纤的输出光束具有类圆形的艾里图案，并能自动聚焦，其最大强度遵循抛物线轨迹。我们还表明，从艾里光纤的输出光束的焦点的位置可以很容易地控制通过改变输入波长。
We propose and theoretically demonstrate a novel optical fiber with an annular arrayed-waveguide to implement Airy phase and amplitude modulation, and generate an abruptly autofocusing circular Airy beam. The properties of wave propagation in Airy fiber and free space are studied by using the coupled-mode theory and angular spectrum method. The calculated results show that the output beam from such a fiber has a circular Airy-like pattern and can autofocus with the intensity maxima following a parabolic trajectory. We also show that the position of the focus point of the output beam from the Airy fiber can be easily controlled by changing input wavelength.