Physics – Optics
Scientific paper
2006-10-12
Physical Review Letters 97(15), 157402 (2006)
Physics
Optics
5 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.97.157402
The refractive index of single microparticles is derived from precise measurement and rigorous modeling of the stiffness of a laser trap. We demonstrate the method for particles of four different materials with diameters from 1.6 to 5.2 microns and achieve an accuracy of better than 1%. The method greatly contributes as a new characterization technique because it works best under conditions (small particle size, polydispersion) where other methods, such as absorption spectroscopy, start to fail. Particles need not be transferred to a particular fluid, which prevents particle degradation or alteration common in index matching techniques. Our results also show that advanced modeling of laser traps accurately reproduces experimental reality.
Heckenberg Norman R.
Knoener Gregor
Nieminen Timo A.
Parkin Simon
Rubinsztein-Dunlop Halina
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