Refractometry of organosilica microspheres

Katrina Y T Seet*, Robert Vogel, Timo A. Nieminen, Gregor Knöner, Halina Rubinsztein-Dunlop, Matt Trau, Andrei V. Zvyagin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1554-1561
Number of pages8
JournalApplied Optics
Volume46
Issue number9
DOIs
Publication statusPublished - 20 Mar 2007
Externally publishedYes

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