Assessment of wavelength dependent complex refractive index of strongly light absorbing liquids

doi:10.1364/OE.20.002835

Assessment of wavelength dependent complex refractive index of strongly light absorbing liquids

Jukka Räty, Pertti Pääkkönen, and Kai-Erik Peiponen »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 2835-2843 (2012)
http://dx.doi.org/10.1364/OE.20.002835

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Abstract

A practical measurement procedure for the determination of the complex refractive index of strongly absorbing liquids within a finite spectral range was developed. The method is based on separate measurements of reflectance and transmittance of the liquid sample, a property of dispersion and absorption, and exploitation of Fresnel’s theory. The advantage of the method is that the knowledge of the layer thickness of the light absorbing medium, which is required typically in transmittance measurements, is not needed. In addition, both measurements, the transmittance and the reflectance, were accomplished with one spectrophotometer using a home-built reflectometer and without any sample dilution. The method is validated by numerical simulation using the Lorentz model for permittivity of an insulator, and also by experimental data obtained from three strongly absorbing offset inks, namely magenta, yellow and cyan.

OCIS Codes
(120.1840) Instrumentation, measurement, and metrology : Densitometers, reflectometers
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(160.4890) Materials : Organic materials
(260.2030) Physical optics : Dispersion
(300.6550) Spectroscopy : Spectroscopy, visible

ToC Category:
Spectroscopy

History
Original Manuscript: December 7, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: January 17, 2012
Published: January 23, 2012

Citation
Jukka Räty, Pertti Pääkkönen, and Kai-Erik Peiponen, "Assessment of wavelength dependent complex refractive index of strongly light absorbing liquids," Opt. Express 20, 2835-2843 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-3-2835

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References

V. Lucarini, J. J. Saarinen, K.-E. Peiponen, and E. M. Vartiainen, Kramers-Kronig relations in Optical Materials Research (Springer, 2005).
R. M. A. Azzam, “Direct relation between Fresnel’s interface reflection coefficients for the parallel and perpendicular polarizations,” J. Opt. Soc. Am. A69(7), 1007–1016 (1979). [CrossRef]
I. Niskanen, J. Räty, K.-E. Peiponen, H. Koivula, and M. Toivakka, “Assessment of the complex refractive index of an optically very dense solid layer: Case study offset magenta ink,” Chem. Phys. Lett.442(4-6), 515–517 (2007). [CrossRef]
J. S. Preston, N. J. Elton, J. C. Husband, J. Dalton, P. J. Heard, and G. C. Allen, “Investigation into the distribution of ink components on printed coated paper. Part 1. Optical and roughness considerations,” Colloids Surf. A Physicochem. Eng. Asp.205(3), 183–198 (2002). [CrossRef]
J. S. Preston and L. F. Gate, “The influence of colour and surface topography on the measurement of effective refractive index of offset printed coated papers,” Colloids Surf. A Physicochem. Eng. Asp.252(2-3), 99–104 (2005). [CrossRef]
N. J. Elton and J. C. C. Day, “A reflectometer for the combined measurement of refractive index, microroughness, macroroughness and gloss of low-extinction surfaces,” Meas. Sci. Technol.20(2), 025309 (2009). [CrossRef]
I. Niskanen, J. Räty, and K.-E. Peiponen, “Complex refractive index of turbid liquids,” Opt. Lett.32(7), 862–864 (2007). [CrossRef] [PubMed]
F. Wooten, Optical Properties of Solids (Academic Press, 1972).
J. Räty, E. Keränen, and K.-E. Peiponen, “The complex refractive index measurement of liquids by a novel reflectometer apparatus for the UV-Vis spectral range,” Meas. Sci. Technol.9(1), 95–99 (1998). [CrossRef]

Allen, G. C.
Azzam, R. M. A.
Dalton, J.
Day, J. C. C.
Elton, N. J.
Gate, L. F.
Heard, P. J.
Husband, J. C.
Keränen, E.
Koivula, H.
Niskanen, I.
Peiponen, K.-E.
Preston, J. S.
Räty, J.
Toivakka, M.

Chem. Phys. Lett.

I. Niskanen, J. Räty, K.-E. Peiponen, H. Koivula, and M. Toivakka, “Assessment of the complex refractive index of an optically very dense solid layer: Case study offset magenta ink,” Chem. Phys. Lett.442(4-6), 515–517 (2007). [CrossRef]

Colloids Surf. A Physicochem. Eng. Asp.

J. S. Preston, N. J. Elton, J. C. Husband, J. Dalton, P. J. Heard, and G. C. Allen, “Investigation into the distribution of ink components on printed coated paper. Part 1. Optical and roughness considerations,” Colloids Surf. A Physicochem. Eng. Asp.205(3), 183–198 (2002). [CrossRef]
J. S. Preston and L. F. Gate, “The influence of colour and surface topography on the measurement of effective refractive index of offset printed coated papers,” Colloids Surf. A Physicochem. Eng. Asp.252(2-3), 99–104 (2005). [CrossRef]

J. Opt. Soc. Am. A

R. M. A. Azzam, “Direct relation between Fresnel’s interface reflection coefficients for the parallel and perpendicular polarizations,” J. Opt. Soc. Am. A69(7), 1007–1016 (1979). [CrossRef]

Meas. Sci. Technol.

J. Räty, E. Keränen, and K.-E. Peiponen, “The complex refractive index measurement of liquids by a novel reflectometer apparatus for the UV-Vis spectral range,” Meas. Sci. Technol.9(1), 95–99 (1998). [CrossRef]
N. J. Elton and J. C. C. Day, “A reflectometer for the combined measurement of refractive index, microroughness, macroroughness and gloss of low-extinction surfaces,” Meas. Sci. Technol.20(2), 025309 (2009). [CrossRef]

Opt. Lett.

I. Niskanen, J. Räty, and K.-E. Peiponen, “Complex refractive index of turbid liquids,” Opt. Lett.32(7), 862–864 (2007). [CrossRef] [PubMed]

Other

F. Wooten, Optical Properties of Solids (Academic Press, 1972).
V. Lucarini, J. J. Saarinen, K.-E. Peiponen, and E. M. Vartiainen, Kramers-Kronig relations in Optical Materials Research (Springer, 2005).

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