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Tunable achromatic liquid crystal waveplates

Updated: Sep 3, 2021

The wavelength dependence of phase retarders is considered as a challenge in different applications such as polarimetric systems.


(a) The structure of a nematic LC cell with anti-parallel alignment at zero voltage. (b) LC molecule and optical axes geometry. (c) Schematic of the device composed of two nematic LC cells at 90 deg to each other. The polarizers are included because they are part of the testing setup of the device. OA1 and OA2 represent the projections of the optic axes on the substrates plane.


Abstract

The wavelength dependence of phase retarders is considered as a challenge in different applications such as polarimetric systems. A novel achromatic waveplate based on two nematic liquid crystal retarders is designed and demonstrated tunable over a wide spectral range using different voltages applied to the two retarders. The achromatic behavior is achieved based on the fact that the dispersion of the retardation of liquid crystals is voltage dependent. Achromatic quarter and half-waveplates are demonstrated using the same device as well as the tunability of the achromatic operation range.


© 2014 Optical Society of America



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