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Real time phase modulation measurements in liquid crystals

Bennis N., Merta I., Kalbarczyk A., Maciejewski M., Marc P., Spadlo A., Jaroszewicz L. R.

Opto-Electronics Review

2017

Vol. 25, No. 2

69--73

We propose real time phase measurements in liquid crystals cells using Young’s interferometer constructed with a new principle with possibility to control the distance between two point sources. The optical interference optical pattern is detected by a bicell photo-detector in a back Fourier focal plane. A phase modulation controlled by a mono pixel liquid crystals’ cell placed in a reference arm of interferometer is observed as a dynamic shift of the fringes’ pattern in spatial domain. Concept of signals’ demodulation in the Fourier focal plane will be described using a new approach to the demodulation signals. In this work we evaluate the demodulation condition of our setup and we present measurements of a dynamic phase response for nematic liquid crystals and antiferroelectric liquid crystals cells.

Influence of a helical pitch on orthoconic antiferroelectric liquid crystals performance

Bennis N., Dąrowski R., Rejmer W., Spadło A., Quintana X., Otón J. M.

Opto-Electronics Review

2011

Vol. 19, No. 1

71-75

Orthoconic antiferroelectric liquid crystals, whose half cone angle is 45°, are of interest in display technology because they are capable of providing greyscale in passively addressing waveform while exhibiting very good contrast. However, orthoconic antiferroelectrics having short pitch are difficult to be aligned, this makes surface stabilized alignment unfeasible. In this case, dynamic behaviour is usually poor, avoiding electronic addressing with standard electronics. In this work, we report the helical pitch measurements of OAFLC mixtures and we compare electrooptical performance of high and low pitch OAFLCs.