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λ >d

λ. λ. λ. λ <d. λ =d. λ >d. d. d. d. Mie regime. Rayleigh regime. Intermediate regime. FOV’ is the incidence plane AWW’ is the vertical plane contains the ray. Z. d. X. O. Y. f. S. f: trap center O: bead center S: offset due to scattering force.

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λ >d

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  1. λ λ λ λ<d λ=d λ>d d d d Mie regime Rayleigh regime Intermediate regime

  2. FOV’ is the incidence plane AWW’ is the vertical plane contains the ray

  3. Z d X O Y f S f: trap center O: bead center S: offset due to scattering force

  4. r: exit pupil radius (output aperture) Fs: scattering force Fg: gradient force n: surface normal f: beam focus θ: incident angle φ: convergence angle S: distance between bead center and focus

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