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Transformation of edge-dislocations to screw-dislocations in the optical field is experimentally and numerically demonstrated. A special multi-edge-dislocation structure is designed by arranging multiple edge-dislocations, which have the same phase-step value, periodically along the azimuthal orientation. Experimentally, in virtue of the computer-generated holography, a Gaussian beam is modulated by the multi-edge-dislocation, whose propagation dynamics is investigated as well. The results reveal that the multi-edge-dislocation can be converted into a screw-dislocation with the evolution of the Gaussian beam into a vortex-like beam. What is more, the sum phase change of the dislocations is conserved in this process. Then, the experimental results are verified by numerical simulations, and discussed in detail by analyzing the evolutions of the linear momentum density. Furthermore, the influence of the phase-step value of the edge-dislocation on the transformation is discussed, which illustrates the quantitative relation between the phase-step value and the topological charge of crew-dislocation.
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Keywords:
- edge-dislocation /
- screw-dislocation /
- vortex beam /
- topological charge
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[11] Gan X T, Zhao J L, Liu S, Fang L 2009 Chin. Opt. Lett. 7 1142
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[13] Cheng K, Liu P S, Lü B D 2008 Chin. Phys. B 17 1743
[14] Grier D G 2003 Nature 424 810
[15] Gibson G, Courtial J, Padgett M J, Vasnetsov M, Pas'ko V, Barnett S M, Franke-Arnold S 2004 Opt. Express 12 5448
[16] Palacios D M 2005 Proc. SPIE 5905 59050N
[17] Heckenberg N R, McDuff R, Smith C P, White A G 1992 Opt. Lett. 17 221
[18] Yang D X, Ren X Y, He D S, Cui Y, Gan X T 2010 Acta Opt. Sin. 30 3323 (in Chinese) [杨德兴、 任小元、 何东升、 崔 勇、 甘雪涛 2010 光学学报 30 3323]
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[1] Nye J F, Berry M V 1974 Proc. R. Soc. London Sect. A 336 165
[2] Basistiy I V, Soskin M S, Vasnetsov M V 1995 Opt. Commun. 119 604
[3] Cullet P, Gil L, Rocca F 1989 Opt. Commun. 73 403
[4] Allen L, Beijersbergen M W, Spreeuw R J C, Woerdman J P 1992 Phys. Rev. A 45 8185
[5] Desyatnikov A S, Kivshar Y S, Torner L 2005 Prog. Opt. 47 291
[6] Skryabin D V, Firth W J 1998 Phys. Rev. E 58 3916
[7] Gan X T, Zhang P, Liu S, Zheng Y M, Zhao J L, Chen Z G 2009 Opt. Express 17 23130
[8] Dong L W, Ye F W, Wang J D, Li Y P 2004 Acta Phys. Sin. 53 3353 (in Chinese) [董亮伟、 叶芳伟、 王建东、 李永平 2004 物理学报 53 3353]
[9] Zhang X B,Zhang W,Shu F J, Li Y P 2007 Acta Phys. Sin. 56 213 (in Chinese) [张晓波、 张 巍、 舒方杰、 李永平 2007 物理学报 56 213]
[10] Rozas D, Sacks Z S, Swartzlander G A 1997 Phys. Rev. Lett. 79 3399
[11] Gan X T, Zhao J L, Liu S, Fang L 2009 Chin. Opt. Lett. 7 1142
[12] Yan H W, Cheng K, Lü B D 2008 Acta Phys.Sin. 57 5542 (in Chinese) [闫红卫、 程 科、 吕百达 2008 物理学报 57 5542]
[13] Cheng K, Liu P S, Lü B D 2008 Chin. Phys. B 17 1743
[14] Grier D G 2003 Nature 424 810
[15] Gibson G, Courtial J, Padgett M J, Vasnetsov M, Pas'ko V, Barnett S M, Franke-Arnold S 2004 Opt. Express 12 5448
[16] Palacios D M 2005 Proc. SPIE 5905 59050N
[17] Heckenberg N R, McDuff R, Smith C P, White A G 1992 Opt. Lett. 17 221
[18] Yang D X, Ren X Y, He D S, Cui Y, Gan X T 2010 Acta Opt. Sin. 30 3323 (in Chinese) [杨德兴、 任小元、 何东升、 崔 勇、 甘雪涛 2010 光学学报 30 3323]
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