OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2835–2843

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)

View Full Text Article

Enhanced HTML    Acrobat PDF (1611 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



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.

© 2012 OSA

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:

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

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)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. V. Lucarini, J. J. Saarinen, K.-E. Peiponen, and E. M. Vartiainen, Kramers-Kronig relations in Optical Materials Research (Springer, 2005).
  2. 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]
  3. 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]
  4. 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]
  5. 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]
  6. 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]
  7. I. Niskanen, J. Räty, and K.-E. Peiponen, “Complex refractive index of turbid liquids,” Opt. Lett.32(7), 862–864 (2007). [CrossRef] [PubMed]
  8. F. Wooten, Optical Properties of Solids (Academic Press, 1972).
  9. 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]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


Fig. 1 Fig. 2 Fig. 3
Fig. 4

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited