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Distance calibration curves of intensity versus bead position (symbols – simulations, lines – fits to exponentials): (A) optical power deposited in the bead and scattered through silica at the absorption stage; (B) total fluorescent power leaving the bead along with detectable power passing through silica; all power is shown as a function of the bead-surface distance. (20% Fe3O4 and 5% CdSe, θ=75°, bead diameter is 1.0 μm)
