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A Revolution in Optical Manipulation
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Microscopic measurement of the pair interaction potential of charge-stabilized colloid
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Equilibrium information fromnonequilibrium measurements in an experimental test of Jarzynski's equality
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Colloidal interactions and self-assembly using DNA hybridization
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Projecting Extended Optical Traps With Shape-Phase Holography
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The manipulation and assembly of CuO nanorods with line optical tweezers
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Entropic colloidal interactions in concentrated DNA solutions
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Optical forces are, in general, non-conservative (see Ref. [16] and references therein) and so measurements of forces reveal pseudopotentials rather than true potential energy functions. In one dimension, however, any force that depends only on position, is necessarily conservative since its integral is uniquely determined. The experiments described here involve only one-dimensional force characterizations, and so determine an effective potential U(x) corresponding to the x-axis components of forces; they do not determine the 3D pseudopotential.
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Optical forces are, in general, non-conservative (see Ref. [16] and references therein) and so measurements of forces reveal pseudopotentials rather than true potential energy functions. In one dimension, however, any force that depends only on position, is necessarily conservative since its integral is uniquely determined. The experiments described here involve only one-dimensional force characterizations, and so determine an effective potential U(x) corresponding to the x-axis components of forces; they do not determine the 3D pseudopotential.
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Dynamic holographic optical tweezers
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Optical Particle Trapping With Computer-Generated Holograms Written on a Liquid-Crystal Display
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The Dizzying Depths of the Cylindrical Mirror
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Optical Forces Arising from Phase Gradients
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84894011437
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2) of 0.9992. The intensity profiles along x are measured along the image row of greatest intensity, averaged over adjacent rows spanning ±0.3μm in y.
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2") of 0.9992. The intensity profiles along x are measured along the image row of greatest intensity, averaged over adjacent rows spanning ±0.3μm in y.
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18
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Methods of Digital Video Microscopy for Colloidal. Studies
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J. C. Crocker and D. G. Grier, "Methods of Digital Video Microscopy for Colloidal. Studies," J. Coll. Interf. Sci. 179, 298-310 (1996).
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Statistics of particle trajectories at short time intervals reveal fN-scale colloidal forces
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84894000846
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A total of approximately ten thousand Δx values were recorded for each line. We find no apparent variation of sxi2, with position or with σm; its value yields a diffusion coefficient D, 0.068 ±0.006μm2/s. In the F(x) plot of Fig. 3b, inset, the mean value off is subtracted; this position-independent force is likely due to convective flow in the chamber or gravitational forces caused by substrate tilt. This offset is irrelevant to the determination of the slope, B
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2/s. In the F(x) plot of Fig. 3(b) (inset), the mean value off is subtracted; this position-independent force is likely due to convective flow in the chamber or gravitational forces caused by substrate tilt. This offset is irrelevant to the determination of the slope, B.
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84893996688
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