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- W2972422015 abstract "Abstract Deflecting light with high efficiency over large angles with thin optical elements is challenging but offers tremendous potential for applications, such as wearable displays and optical communication systems. Compared to the complex production of metasurfaces, the self‐organization of liquid crystal (LC) superstructures provides an elegant and flexible way to produce high‐quality thin optical components. The periodically varying dielectric tensor in short‐pitch chiral LC gives rise to a photonic bandgap, which can be exploited to realize efficient diffractive mirrors in the visible wavelength range. However, large‐angle diffractive devices require a small in‐plane period, leading to complex self‐assembly behavior in the bulk. This work demonstrates that by patterning photoalignment layers at the surfaces with a period comparable to the chiral pitch, the LC self‐assembles into a tilted, defect‐free helical structure. The director configuration is calculated by finite element simulations and it is experimentally demonstrated that a single photoaligned substrate is sufficient to template the tilted chiral structure in the bulk. This structure effectively (88%) diffracts light over large angles (≈46°) and enables novel micrometer‐thin (≈3 µm) optical components that can be produced with an elegant manufacturing process. Due to flexibility of photoalignment, this process could easily be implemented in emerging photonic applications." @default.
- W2972422015 created "2019-09-19" @default.
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- W2972422015 date "2019-09-10" @default.
- W2972422015 modified "2023-10-02" @default.
- W2972422015 title "Tilted Chiral Liquid Crystal Gratings for Efficient Large‐Angle Diffraction" @default.
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- W2972422015 doi "https://doi.org/10.1002/adom.201901364" @default.
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