Characterisation of optically cleared paper by optical coherence tomography

T. Fabritius*, E. Alarousu, T. Prykäri, J. Hast, R. Myllylä

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Due to the highly light scattering nature of paper, the imaging depth of optical methods such as optical coherence tomography (OCT) is limited. In this work, we study the effect of refractive index matching on improving the imaging depth of OCT in paper. To this end, four different refractive index matching liquids (ethanol, 1-pentanol, glycerol and benzyl alcohol) with a refraction index between 1.359 and 1.538 were used in experiments. Low coherent light transmission was studied in commercial copy paper sheets, and the results indicate that benzyl alcohol offers the best improvement in imaging depth, while also being sufficiently stable for the intended purpose. Constructed cross-sectional images demonstrate visually that the imaging depth of OCT is considerably improved by optical clearing. Both surfaces of paper sheets can be detected along with information about the sheet's inner structure.

Original languageEnglish (US)
Pages (from-to)181-187
Number of pages7
JournalQuantum Electronics
Issue number2
StatePublished - Feb 2006


  • Imaging depth
  • Light coherence
  • Light transmittance
  • Optical clearing agent
  • Optical coherence tomography
  • Optical length
  • Paper testing
  • Refraction index mismatch

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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