Fig. 5.
Effects of beam power, wavelength, bead size, and refractive index on radiation-pressure force. (a) Frad at the focal plane as function of forcing beam power (a: 1.5 µm; medium: 10% glycerol). (b) Frad at the focal plane as a function of bead diameter (P: 140 mW; medium: 10% glycerol). (c) Frad at the focal plane as a function of relative refractive index (a: 1.5 um; P: 140 mW). (d) Comparison of depth-dependent Frad from the forcing beam with wavelength of 789 nm versus 976 nm (a: 1.5 um; P: 54, 79, 140 mW; medium: water). Plotted data points represent median values of Frad(z) obtained from N = 16 beads for 789 nm and N = 15 beads for 976 nm. Inset shows GLMT predictions of Frad(z) per unit power for the two cases. In (a-c), vertical error bars represent ± 1 standard deviation of results obtained from N = 10-16 beads (except in (b), N = 5 for 2a = 0.46 µm and in (c), N = 7 for DMSO). In (b), horizontal error bars represent the bead size distribution reported by the manufacturers.