期刊
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
卷 525, 期 -, 页码 41-49出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421401003795910
关键词
Electro-optic; flexoelectricity; liquid crystals application; polymer structure
资金
- EPSRC [EP/F013787/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F013787/1] Funding Source: researchfish
The chiral flexo-electro-optic effect produces a sub-millisecond, temperature independent in-plane rotation of the optical axis and is potentially interesting for the display industry. The main drawback in the exploitation of this effect is that it relies on a texture, the Uniform Lying Helix (ULH), which is intrinsically unstable since neither planar nor homeotropic surface conditions are compatible with it. We present a method, based on the use of periodic polymeric micro-channels, to create highly ordered and stable ULH structures. We show that the periodic structure, which is created holographically, naturally aligns the cholesteric helical superstructure along the micro-channels, without requiring any elaborate ad-hoc procedure, even when the size K of the micro-channels is much larger than the pitch P (Lambda > 20P). Electro-optic measurements performed on the test-device show a large contrast ratio between bright and dark states (better then 100:1), short switching time (200 mu s) and large optical rotation (> 30 degrees).
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