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Opt Express. 2013 May 20;21(10):12135-44. doi: 10.1364/OE.21.012135.

Determination of surface nematic liquid crystal anchoring strength using nano-scale surface grooves.

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Department of Electronics, Hanbat National University, Dongseodaero 125, Yuseong-Gu, Daejeon 305-719, South Korea.


Based on several nano-scale groove models, we propose a new technique to simultaneously determine the azimuthal and polar surface anchoring strengths of nematic liquid crystal (LC). The optical analysis of LCs on a grooved surface made by nanoimprinting lithography was performed on special alignment material, using a typical rubbing process. In our approach, using a polarizing microscope, we can determine the LC alignment exactly as it is in a parallel state, rather than a twisted state. This simple proposed method gives an accurate value of the surface LC anchoring of various surfaces, as well as simultaneously measuring the azimuthal and polar anchoring energy.

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