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  • Title: Rotatable diffractive gratings based on hybrid-aligned cholesteric liquid crystals.
    Author: Lin CH, Chiang RH, Liu SH, Kuo CT, Huang CY.
    Journal: Opt Express; 2012 Nov 19; 20(24):26837-44. PubMed ID: 23187537.
    Abstract:
    This work proposes a thermally rotatable grating that is based on hybrid-aligned cholesteric liquid crystals (HBA-cholesteric LCs). Experiments reveal that the HBA-cholesteric texture has a uniformly striped domain, which forms a grating, when the ratio of the cell gap to the helical pitch (d/p) is in the range of 2≤d/p≤3. The stripe direction of the HBA-cholesteric grating is predicted by the proposed vertically aligned LC layer model. The stripe direction of the HBA-cholesteric grating rotates continuously under thermal and electrical effects. Furthermore, the HBA-cholesteric grating has a larger rotational angle under the thermal effect (~101°) than under the electrical effect (~48°). Potential applications of the proposed thermally rotatable cholesteric grating for beam steering devices are emphasized.
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