The maximum axial trapping efficiency Q
max has been measured in water, ethanol, butanol and octanol for polystyrene latex spheres having a diameter of 2-15 μm. The effects of the diameter of the particle as well as the refractive index and the viscosity of surrounding medium have been investigated.For particles of d≥7 μm, Q
max is almost independent of particle size, while it decreases as the diameters decrease to d≤5 μm. It is also noted that Q
maxis affected by the viscosity rather than the refractive index of the surrounding medium.
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