Refractometry of organosilica microspheres

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

doi:10.1364/AO.46.001554

Applied Optics
Vol. 46,
Issue 9,
pp. 1554-1561
(2007)
•https://doi.org/10.1364/AO.46.001554

Refractometry of organosilica microspheres

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

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Katrina Y. T. Seet, Robert Vogel, Timo A. Nieminen, Gregor Knöner, Halina Rubinsztein-Dunlop, Matt Trau, and Andrei V. Zvyagin, "Refractometry of organosilica microspheres," Appl. Opt. 46, 1554-1561 (2007)

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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 $300 - 1100 nm$ .

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	A	B (×10⁻³ μm⁻²)	C (×10⁻⁴ μm⁻⁴)	Wavelength λ (nm)
Ma et al. polystyrene[16]	1.5725	3.1080	3.4779	390–1310
2.01 μm polystryene	1.5865	−4.700	12.0	390–1100
5.26 μm polystyrene	1.5736	3.0499	4.0497	390–1100
Fused silica[27]	1.4492	3.1200	0.3670	200–2000
Organosilica	1.5169	0.4231	6.6304	430–1100

	f _o (Hz)	α (pN∕nm)	β (×10⁻⁹ pN∕nm)
2.09 μm PS	2714	0.31	19.72
5.16 μm ogSI	383	0.117	48.6

	A	B (×10⁻³ μm⁻²)	C (×10⁻⁴ μm⁻⁴)	Wavelength λ (nm)
Ma et al. polystyrene[16]	1.5725	3.1080	3.4779	390–1310
2.01 μm polystryene	1.5865	−4.700	12.0	390–1100
5.26 μm polystyrene	1.5736	3.0499	4.0497	390–1100
Fused silica[27]	1.4492	3.1200	0.3670	200–2000
Organosilica	1.5169	0.4231	6.6304	430–1100

	f _o (Hz)	α (pN∕nm)	β (×10⁻⁹ pN∕nm)
2.09 μm PS	2714	0.31	19.72
5.16 μm ogSI	383	0.117	48.6

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Applied Optics