摘要
贝塞尔光束具有无衍射、自重建等特性,在光镊、生物成像等领域具有重要的应用价值。基于角谱理论,分析了贝塞尔光束被障碍物遮挡后的自重建行为,提出利用互相关系数来表征贝塞尔重建光束和原光束截面光强分布的相似性,从而在理论模拟中确定恢复距离,并得到障碍物不同参数对贝塞尔光束自重建的影响。理论模拟结果表明,恢复距离和障碍物大小并非简单的线性关系,障碍物只有在阻挡更多的光束旁瓣时,恢复距离才会增加,而且离轴障碍物比轴上障碍物需要更长的恢复距离;对于轴上障碍物而言,当其尺寸小于高阶贝塞尔光束的中空区域时,高阶贝塞尔光束有着更强的自愈能力。同时进行了实验验证,利用空间光调制器产生可调控的贝塞尔光束用于验证仿真结果,实验结果与仿真结果吻合,说明基于角谱理论的互相关系数法可以用于精准验证贝塞尔光束的自重建特性。
The Bessel beam has the characteristics of non-diffraction and reconstruction,and has important application value in the fields such as optical tweezers and biological imaging.Based on the angular spectrum theory,the reconstruction behavior of the Bessel beam blocked by obstacles is analyzed,and the cross-correlation coefficient is used to characterize the similarity of the cross-section intensity distributions of the reconstructed Bessel beam and the original one,thus to determine the recovery distance in the simulation,and get the influence of different obstacles on Bessel beam reconstruction.The simulation results show that the relationship between the recovery distance and the obstacle size is not simply linear.The recovery distance will only increase when the obstacle blocks more sidelobes and the off-axis obstacle causes longer recovery distance than that of the on-axis obstacle.For on-axis obstacles,when their sizes are smaller than the hollow areas of the high-order Bessel beam,the high-order Bessel beam has a stronger self-healing ability.In the experiment,the spatial light modulator is used to generate a flexible Bessel beam to verify the simulation results.The experimental results are in good agreement with the simulation results,which indicates that the cross-correlation method based on the angular spectrum theory can accurately simulate the reconstruction characteristics of Bessel beam.
作者
谢家俊
许杭史
余文慧
胡睿
屈军乐
刘丽炜
Xie Jiajun;Xu Hangshi;Yu Wenhui;Hu Rui;Qu Junle;Liu Liwei(Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第6期286-293,共8页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61935012/61835009,62175163,61961136005)
深圳市科技计划国际合作项目(GJHZ20190822095420249)
深圳市重点项目(JCYJ20200109105404067)。
关键词
医用光学与生物技术
贝塞尔光束
自重建
角谱理论
空间光调制器
medical optics and biotechnology
Bessel beam
reconstruction
angular spectrum theory
spatial light modulator
