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The double-ring perfect vortex beam (DR-PVB) is generated through the superposition of two concentric perfect vortex beams (PVBs). In this work, firstly, the intensity and phase distribution of the DR-PVB in the source plane are studied. Secondly, based on the Huygens-Fresnel principle and the Collins formula, the intensity distribution of the DR-PVB after being focused by an ABCD optical system that includes a focusing lens is obtained. The results indicate that the intensity distribution of the focused beam is consistent with the interference pattern of two Bessel Gaussian beams. Furthermore, the number of spots in the focused intensity distribution is a multiple of the absolute value of the difference in topological charges between two PVBs. On the other hand, the overall size of the light beam can be adjusted by changing the focal length of the lens. Thirdly, the optical radiation force, exerted by the focused DR-PVB, on Rayleigh particles with different refractive indices, silica and bubbles, are analyzed, respectively. The results show that the focused DR-PVB can capture both high and low refractive index particles in water. In addition, by comparing the focused DR-PVBs under different radius combinations, it found that the light intensity distribution can be changed with the beam radius, which leads the position and quantity of the captured particles to change. This result provides a new idea for adjusting the capture of particles in future experiments. Finally, the gradient forces, scattering, and Brownian forces acting on the particles in the x, y, and z directions are analyzed, respectively. Based on our analysis, the condition for stable particle capture, where the gradient force must overcome the effects of Brownian motion and scattering forces, is established. Therefore, the theoretical size range of particles that can be captured by the focused DR-PVB is determined. Compared with other beams, such as Airy beams and Bessel beams, the focused DR-PVB can be modulated by changing the topological charges of the two PVBs, making it possible to capture multiple particles. These results have potential applications in optical manipulation.
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不同R组合 焦平面处光强极大值位置 R1 = 800 μm,
R2 = 600 μm第1组 (0, ±4.286, 0), (±2.519, ±3.467, 0), (±4.076, ±1.324, 0) 第2组 (±1.898, ±5.843, 0), (±4.97, ±3.611, 0), (±6.144, 0, 0) 第3组 (±2.69, ±8.27, 0), (±7.043, ±5.117, 0), (±8.706, 0, 0) R1 = 800 μm,
R2 = 500 μm第1组 (0, ±4.244, 0), (±2.494, ±3.433, 0), (±4.036, ±1.311, 0) 第2组 (±1.996, ±6.145, 0), (±5.227, ±3.798, 0), (±6.461, 0, 0) 第3组 (0, ±8.160, 0), (±4.796, ±6.601, 0), (±7.760, ±2.521, 0) 第4组 (±2.839, ±8.740, 0), (±7.435, ±5.401, 0), (±9.190, 0, 0) 第5组 (0, ±10.658, 0), (±10.136, ±3.293, 0), (±6.264, ±8.622, 0) 
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不同R组合 稳定俘获位置 R1 = 600 μm, R2 = 800 μm 第1组 (0, ±4.286, –0.502) (±2.519, ±3.467, –0.502) (±4.076, ±1.324, –0.502) 第2组 (±1.898, ±5.843, –0.427) (±4.97, ±3.611, –0.427) (±6.144, 0, –0.427) 第3组 (±2.69, ±8.27, –0.745) (±7.043, ±5.117, –0.745) (±8.706, 0, –0.745) R1 = 500 μm, R2 = 800 μm 第1组 (0, ±4.244, –0.346) (±2.49, ±3.43, –0.346) (±4.03, ±1.31, –0.346) 第2组 (±1.99, ±6.14, –0.308) (±5.22, ±3.79, –0.308) (±6.46, 0, –0.308) 第3组 (0, ±8.160, –0.2) (±4.796, ±6.601, –0.2) (±7.760, ±2.521, –0.2) 第4组 (0, ±10.658, –0.37) (±10.136, ±3.293, –0.37) (±6.264, ±8.622, –0.37)
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不同R组合 焦平面处光强极小值位置 R1 = 800 μm, R2 = 600 μm 第1组 (±1.415, ±4.357, 0), (±3.706, ±2.693, 0), (±4.581, 0, 0) R1 = 800 μm, R2 = 500 μm 第1组 (±1.505, ±4.634, 0) (±3.942, ±2.864, 0) (±4.872, 0, 0) 2组 (0, ±6.731, 0) (±3.956, ±5.445, 0) (±6.401, ±2.08, 0) 第3组 (±2.545, ±7.833, 0) (±6.663, ±4.840, 0) (±8.236, 0, 0) 第4组 (0, ±9.427, 0) (±5.541, ±7.627, 0) (±8.966, ±2.913, 0)
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不同R组合 稳定俘获位置 R1 = 600 μm, R2 = 800 μm 第1组 (±1.415, ±4.357, 0) (±3.706, ±2.693, 0) (±4.581, 0, 0) R1 = 500 μm, R2 = 800 μm 第1组 (±1.505, ±4.634, 0) (±3.942, ±2.864, 0) (±4.872, 0, 0) 第2组 (0, ±6.731, –0.005) (±3.956, ±5.445, –0.005) (±6.401, ±2.08, –0.005) 第3组 (±2.545, ±7.833, –0.001) (±6.663, ±4.840, –0.001) (±8.236, 0, –0.001) 第4组 (0, ±9.427, 0) (±5.541, ±7.627, 0) (±8.966, ±2.913, 0)
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不同半径组合对不同粒子的俘获半径范围 高折射率粒子 低折射率粒子 R1 = 600 μm, R2 = 800 μm 0.44 nm < a < 22.07 nm 0.50 nm < a < 23.35 nm R1 = 500 μm, R2 = 800 μm 0.47 nm < a < 23.53 nm 0.47 nm < a < 22.68 nm
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[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35]
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