Application of Modified Interference Wedge Method in Measurements of Indices of Refraction and Birefringence of Nematic Liquid Crystals

• Authors: K. Kowiorski , J. Kędzierski , Z. Raszewski , M. Kojdecki , J. Herman , E. Miszczyk , W. Piecek
• Languages of publication: EN

Abstracts

EN

Wedge cell filled with a homogeneously oriented nematic liquid crystal was exploited as an interference wedge to measuring indices of refraction. Interference fringes from the wedge were observed in polarised light in reflection or transmission mode of a polarisation microscope to determining ordinary and extraordinary indices of refraction or birefringence (i.e. anisotropy of both indices). The interference fringes close to wedge apex were uniform and could be well described in two-beam interference approximation. The refractive indices were computed with using simple formulae involving only distances between subsequent fringes in a cell filled with the liquid crystal and an empty reference cell. Several new highly-birefringent nematic mixtures produced in the Military University of Technology were investigated. The 6CHBT nematic was used as the reference material.

Keywords

EN

78.15.+e

Discipline

• 78.15.+e: Optical properties of fluid materials, supercritical fluids and liquid crystals(for reactions in supercritical fluids, see 82.33.De)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 6
• Pages: 946-948

Dates

published

2013-12

Contributors

author

K. Kowiorski

• Institute of Technical Physics, University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

J. Kędzierski

• Institute of Technical Physics, University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

Z. Raszewski

• Institute of Technical Physics, University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

M. Kojdecki

• Institute of Mathematics and Cryptology, Military University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

J. Herman

• Institute of Chemistry, Military University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

author

E. Miszczyk

• Institute of Physics, University of Technology and Humanities, Malczewskiego 29, 26-100 Radom, Poland

author

W. Piecek

• Institute of Technical Physics, University of Technology, S. Kaliskiego 2, 00-908 Warszawa, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.124.946