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研究了球形粒子在聚焦拉盖尔-高斯光束中的散射特性. 根据广义Mie理论, 推导出球形粒子在聚焦拉盖尔-高斯光束中散射系数的解析公式. 针对光束的电场分布及粒子散射强度进行了数值仿真, 讨论了散射强度随散射角、散射球粒子半径和拓扑荷的变化特性, 并通过散射系数解释了散射强度分布的振荡现象. 结果表明, 在聚焦拉盖尔-高斯光束照射下, 球形粒子的后向散射强度随着粒子半径的增大而逐渐增大; 后向散射强度开始增大时对应的粒子半径与拓扑荷有关. 通过与高斯光束的对比, 可以看出球形粒子在聚焦拉盖尔-高斯光束中散射特性的差异, 使其在粒径测量、光通信和大气后向散射探测等方面具有潜在应用价值.
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关键词:
- 聚焦拉盖尔-高斯光束 /
- 广义Mie理论 /
- 球形粒子 /
- 拓扑荷
Scattering of the focused Laguerre-Gaussian beams by a spherical particle is performed. According to the generalized Mie theory, the scattering coefficient expressions are gained. From the numerical simulations of the electric field distribution and scattering intensity of the focused Laguerre-Gaussian beams, the scattering intensities are discussed for different scattering angles, radii of spherical particles and topology changes, and the oscillatory behavior of the scattered intensity distribution is explained by the scattering coefficients. The results show that in the focused Laguerre-Gaussian beams, the backscattering intensity increases with the particle radius; and the particle radius when the scattering intensity begins to increase is related to the topological charge. Comparing with the Gaussian beams, we can see that the focuced Laguerre-Gaussian beams have different the scattering characteristics, so they have potential value for particle size measurement, optical communication, atmospheric backscattering detection, etc.-
Keywords:
- focused Laguerre-Gaussian beam /
- generalized Mie theory /
- spherical particle /
- topological charge
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[2] Allen L, Beijersbergen M W, Spreeuw R J, Woerdman J P 1992 Phys. Rev. A 45 8185
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[18] van de Nes A S, T? r? k P 2007 Opt. Express 15 13360
[19] Abramowitz M, Stegun I A 1970 Handbook of Mathematical Functions (New York: Dover Publications) p146–155
[20] van de Hulst H C 1981 Light Scattering by Small Particles (New York: Dover publications) p114–128
[21] Poincelot P 1963 Precis d’Electromagnetisme Theorique (Paris: Dunod) p89–112
[22] Mie G 1908 Ann. Phys. 330 377
[23] Wu Z S, Yuan Q K, Peng Y, Li Z J 2009 J. Opt. Soc. Am. A 26 1778
[24] Wu P, Han Y P, Liu D F 2005 Acta Phys. Sin. 54 2676 (in Chinese) [吴鹏, 韩一平, 刘德芳 2005 54 2676]
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[1] Allen L, Padgett M J, Babiker M, Wolf E 1999 Prog. Optics 39 291
[2] Allen L, Beijersbergen M W, Spreeuw R J, Woerdman J P 1992 Phys. Rev. A 45 8185
[3] Simpson N, Dholakia K, Allen L, Padgett M 1997 Opt. Lett. 22 52
[4] O Neil A, Padgett M 2001 Opt. Commun. 193 45
[5] Mair A, Vaziri A, Weihs G, Zellinger A 2001 Nature 412 313
[6] Bouchal Z, Celechovsky R 2004 New J. Phys. 6 131
[7] Gibson G, Courtial J, Padgett M J, Vasnetsov M, Pas’ko V, Barnett S M, Franke-Arnold S 2004 Opt. Express 12 5448
[8] Li F, Jiang Y S, Tang H, Wang H Y 2009 Acta Phys. Sin. 58 6202 (in Chinese) [黎芳, 江月松, 唐华, 王海洋 2009 58 6202]
[9] Li F, Tang H, Jiang Y S, Ou J 2011 Acta Phys. Sin. 60 014204 (in Chinese) [黎芳, 唐华, 江月松, 欧军 2011 60 014204]
[10] Lü H, Ke X Z 2009 Acta Phys. Sin. 58 8302 (in Chinese) [吕宏, 柯熙政 2009 58 8302]
[11] Gao M W, Gao C Q, He X Y, Li J Z, Wei G H 2004 Acta Phys. Sin. 53 413 (in Chinese) [高明伟, 高春清, 何晓燕, 李家泽, 魏光辉 2004 53 413]
[12] Garbin V, Volpe G, Ferrari E, Versluis M, Cojoc D, Petrov D 2009 New J. Phys. 11 013046
[13] Davis L W 1979 Phys. Rev. A 19 1177
[14] Gouesbet G, Maheu B, Grehan G 1988 J. Opt. Soc. Am. A 5 1427
[15] Gouesbet G, Grehan G, Maheu B 1988 Appl. Opt. 27 4874
[16] Gouesbet G, Grehan G, Maheu B 1990 J. Opt. Soc. Am. A 7 998
[17] van de Nes A S, Pereira S F, Braat J J M 2006 J. Mod. Opt. 53 677
[18] van de Nes A S, T? r? k P 2007 Opt. Express 15 13360
[19] Abramowitz M, Stegun I A 1970 Handbook of Mathematical Functions (New York: Dover Publications) p146–155
[20] van de Hulst H C 1981 Light Scattering by Small Particles (New York: Dover publications) p114–128
[21] Poincelot P 1963 Precis d’Electromagnetisme Theorique (Paris: Dunod) p89–112
[22] Mie G 1908 Ann. Phys. 330 377
[23] Wu Z S, Yuan Q K, Peng Y, Li Z J 2009 J. Opt. Soc. Am. A 26 1778
[24] Wu P, Han Y P, Liu D F 2005 Acta Phys. Sin. 54 2676 (in Chinese) [吴鹏, 韩一平, 刘德芳 2005 54 2676]
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