【摘 要】
：
The propagation characteristics of the circular Airy beam(CAB)with low-pass filtering modification is investigated in details in this paper.Based on a modification of the angular spectrum of CAB,we ge
【机 构】
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Shenzhen University China
【出 处】
：
2016年第二届光子学与光学工程国际会议暨第八届西部光子学会议
论文部分内容阅读
The propagation characteristics of the circular Airy beam(CAB)with low-pass filtering modification is investigated in details in this paper.Based on a modification of the angular spectrum of CAB,we get a new kind of CAB constructed with low frequency angular spectrum(LCAB).A suitable low-pass filtering is introduced to cut off the high frequency angular spectrum and maintain the low frequency domain mainly affecting the front light rings of CAB.Two apodization parameters are employed to optimize the low-pass filtering,which influence the propagation characteristic of LCAB.Fortunately,the abruptly autofocusing property,the most important property of CAB,is still maintained in LCAB.What is more,the initial ring number and the focal spot length can be controlled by adjusting the two apodization parameters.If the two apodization parameters are appropriately chosen,one can form an elegant optical needle which plays an important role in optical manipulations.The numerical results show that the less front light rings are,the longer the optical needle is.It should be noted that the width of the optical needle will increase as long as its length increases,leading to the decline of the maximum intensity of the optical needle.
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