光学学报, 2014, 34 (6): 0601002, 网络出版: 2014-06-10
强聚焦涡旋光束经过散射介质的实验研究
Experimental Study of Tightly Focused Vortex Beams Through Turbid Media
摘要
激光束经过大数值孔径透镜聚焦后,可以得到一个亚波长大小的聚焦光斑,能够用于显微技术、光刻和数据存储。通过实验的方法,研究了强聚焦的涡旋光与非涡旋光经过散射介质的透射率,并分析聚焦透镜数值孔径和涡旋光拓扑荷数对聚焦光透过散射介质能力的影响。实验结果显示:在相同的实验条件下,涡旋光的透射能力比非涡旋光更强;拓扑荷数越大,聚焦光透射能力越强;数值孔径越大,聚焦光的透射能力越强。
Abstract
A subwavelength focal spot can be generated by tightly focused laser beams through lens with large numerical aperture (NA), which may have potential applications in microscopy, photoetching and data storage. The transmittances of tightly focused vortex beams and non-vortex beams through turbid media are experimentally studied. The influences of the NA of objective and the topological charge of vortex beam on the transmittance are investigated in details. The experimental results show that the transmittance is stronger if beam carries spiral phase under the same experimental conditions. Moreover, a larger topological charge and a larger NA can produce a stronger transmittance.
孙存志, 陈子阳, 蒲继雄. 强聚焦涡旋光束经过散射介质的实验研究[J]. 光学学报, 2014, 34(6): 0601002. Sun Cunzhi, Chen Ziyang, Pu Jixiong. Experimental Study of Tightly Focused Vortex Beams Through Turbid Media[J]. Acta Optica Sinica, 2014, 34(6): 0601002.