单粒子散射对拉盖尔-高斯光束轨道角动量的影响
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摘要
通过时域有限差分法,研究了单粒子散射对拉盖尔-高斯(LG)光束轨道角动量态传输的影响,分别研究了散射粒径、粒子位置、椭球粒子半径比、倾斜角度及LG光束初始轨道角动量模式对轨道角动量态衰减的影响。研究结果表明:散射粒子半径越大,轨道角动量态的衰减越严重;散射粒子与光束相对位置的变化,也会引起能量占比的规律变化;初始轨道角动量模式、椭球粒子半径比和倾斜角度对轨道角动量态的衰减均有不同程度的影响。
The influence of single-particle scattering on the state transmission of orbital angular momentum(OAM)of Laguerre-Gaussian(LG)beams is studied by using the finite-difference time-domain method.The effects of particle size,particle position,ellipsoidal-particle-radii ratio,orientation angle and initial OAM mode of LG beams on the state degradation of OAM are investigated,respectively.The research results show that the larger the particle radius is,the more serious the OAM state degradation is.The change of the relative position between the scattering particles and the beam also leads to the regular change of the energy proportion.The initial OAM mode,ellipsoidal-particle-radii ratio and orientation angle all have influences on the state degradation at different extents.
The influence of single-particle scattering on the state transmission of orbital angular momentum(OAM)of Laguerre-Gaussian(LG)beams is studied by using the finite-difference time-domain method.The effects of particle size,particle position,ellipsoidal-particle-radii ratio,orientation angle and initial OAM mode of LG beams on the state degradation of OAM are investigated,respectively.The research results show that the larger the particle radius is,the more serious the OAM state degradation is.The change of the relative position between the scattering particles and the beam also leads to the regular change of the energy proportion.The initial OAM mode,ellipsoidal-particle-radii ratio and orientation angle all have influences on the state degradation at different extents.
引文
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[2]Beijersbergen M W,Coerwinkel R P C,Kristensen M,et al.Helical-wavefront laser beams produced with a spiral phaseplate[J].Optics Communications,1994,112(5):321-327.
[3]Yu V B,Vasnetsov M V,Soskin M S.Laser beams with screw dislocations in their wavefronts[J].Nature Genetics,1990,47(1):73-77.
[4]Yu S.Potentials and challenges of using orbital angular momentum communications in optical interconnects[J].Optics Express,2015,23(3):3075-3087.
[5]Djordjevic I B.OAM-based hybrid free-space opticalterahertz multidimensional coded modulation and physical-layer security[J].IEEE Photonics Journal,2017,9(4):1-12.
[6]Zhou Z Y,Li Y,Ding D S,et al.Classical to quantum optical network link for orbital angular momentum-carrying light[J].Optics Express,2015,23(14):18435-18444.
[7]Fickler R,Campbell G,Buchler B,et al.Quantum entanglement of angular momentum states with quantum numbers up to 10,010[J].Proceedings of the National Academy of Sciences of the United States of America,2016,113(48):13642-13647.
[8]Ge X L,Wang B Y,Guo C S.Beam broadening of vortex beams propagating in turbulent atmosphere[J].Acta Optica Sinica,2016,36(3):0301002.葛筱璐,王本义,国承山.涡旋光束在湍流大气中的光束扩展[J].光学学报,2016,36(3):0301002.
[9]Peng B,Zhong K,Li Z Y.Influence of topological charge on turbid underwater propagation of LaguerreGaussian vortex beams[J].Acta Optica Sinica,2017,37(6):0601005.彭波,钟昆,李中云.拓扑荷数对拉盖尔-高斯涡旋光浑浊水下传输的影响[J].光学学报,2017,37(6):0601005.
[10]Li L W,Kooi P S,Leong M S,et al.Microwave attenuation by realistically distorted raindrops:Part I.Theory[J].IEEE Transactions on Antennas&Propagation,1995,43(8):811-822.
[11]LüH,Ke X Z.Scattering of a beam with orbital angular momentum by a single sphere[J].Acta Physica Sinica,2009,58(12):8302-8308.吕宏,柯熙政.具有轨道角动量光束入射下的单球粒子散射研究[J].物理学报,2009,58(12):8302-8308.
[12]Zhao J Z,Jiang Y S,Ou J,et al.Scattering of the focused Laguerre-Gaussian beams by a spherical particle[J].Acta Physica Sinica,2012,61(6):064202.赵继芝,江月松,欧军,等.球形粒子在聚焦拉盖尔-高斯光束中的散射特性研究[J].物理学报,2012,61(6):064202.
[13]Kiselev A D,Plutenko D O.Mie scattering of Laguerre-Gaussian beams:Photonic nanojets and near-field optical vortices[J].Physical Review A,2014,89(4):043803.
[14]Kiselev A D,Plutenko D O.Light scattering of Laguerre-Gaussian beams:Near-field structures and symmetries[J].Nanosystems:Physics,Chemistry,Mathematics,2016,7(2):349-370.
[15]Qu T,Wu Z S,Wei Y Y,et al.Analysis of scattering of Laguerre-Gaussian vortex beam by biological cells[J].Acta Optica Sinica,2015,35(s1):s129002.屈檀,吴振森,韦尹煜,等.拉盖尔高斯涡旋光束对生物细胞的散射特性分析[J].光学学报,2015,35(s1):s129002.
[16]Sun W,Hu Y,Weimer C.FDTD modeling of OAM beam′s interaction with dielectric particle[C].IEEE Progress in Electromagnetic Research Symposium,2016:3295.
[17]Ge X L,Wei G X,Liu X J,et al.Intensity distribution and optical vortex wander of vortex0629001-8beams propagating in turbulent atmosphere[J].Acta Optica Sinica,2016,36(10):1026015.葛筱璐,魏功祥,刘晓娟,等.湍流大气中涡旋光束的光强分布及光学涡旋的漂移[J].光学学报,2016,36(10):1026015.
[18]Yee K.Numerical solution of initial boundary value problems involving Maxwell′s equation in isotropic media[J].IEEE Transactions on Antennas&Propagation,1966,14(3):302-307.
[19]Sun W,Fu Q,Chen Z.Finite-difference time-domain solution of light scattering by dielectric particles with a perfectly matched layer absorbing boundary condition[J].Applied Optics,1999,38(15):3141-3151.