Refractometry of organosilica microspheres.
The refractive index of novel organosilica (nano/micro) material is determined using two methods. The first method is based on analysis of optical extinction efficiency of organosilica beads versus wavelength, which is obtained by a standard laboratory spectrometer. The second method relies on the measurable trapping potential of these beads in the focused light beam (laser tweezers). Polystyrene beads were used to test these methods, and the determined dispersion curves of refractive-index values have been found accurate. The refractive index of organosilica beads has been determined to range from 1.60 to 1.51 over the wavelength range of 300-1100 nm.
Seet
Katrina Y T
KY
Center for Biophotonics and Laser Science, School of Physical Sciences, The University of Queensland, Brisbane, Australia. seet@physics.uq.edu.au
Vogel
Robert
R
Nieminen
Timo A
TA
Knöner
Gregor
G
Rubinsztein-Dunlop
Halina
H
Trau
Matt
M
Zvyagin
Andrei V
AV