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Open AccessArticle

Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals

1
Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan
2
Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK
*
Author to whom correspondence should be addressed.
Cheng-Kai Liu and Chian-Yu Chiu contributed equally.
Materials 2017, 10(11), 1299; https://doi.org/10.3390/ma10111299
Received: 22 September 2017 / Revised: 5 November 2017 / Accepted: 8 November 2017 / Published: 13 November 2017
A linear-polarization rotator based on the optically tunable pitch of chiral-azobenzene-doped liquid crystals (CAdLCs) has been investigated. It is shown that the orientation of linearly polarized (LP) light can be optically tuned using CAdLCs and that the transmitted light possesses a good degree of linear polarization (DoLP). Experimental and simulation (4 × 4 Berreman matrix) results show that the rotation angle is dependent on the pitch as well as the number of turns of the cholesteric LC helix. Some causes to affect the DoLP of the output LP lights during photoisomerization are also discussed. Moreover, a calibration term, β(t), is also introduced to elucidate the behavior of the discontinuous change of the CAdLC pitch in a fixed cell thickness. View Full-Text
Keywords: liquid crystal; polarization; chiral azobenzene liquid crystal; polarization; chiral azobenzene
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MDPI and ACS Style

Liu, C.-K.; Chiu, C.-Y.; Morris, S.M.; Tsai, M.-C.; Chen, C.-C.; Cheng, K.-T. Optically Controllable Linear-Polarization Rotator Using Chiral-Azobenzene-Doped Liquid Crystals. Materials 2017, 10, 1299.

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