4,665 research outputs found

    Fast algorithms for liquid crystal modelling

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    We review different modeling and computational methods to determine the Q-tensor representation of the director field alignment in the absence of defects. Under this condition it is possible to represent the reorientation dynamics of the director field as the motion of the Q-tensor over an invariant manifold. This new representation allows us to develop very accurate codes for the alignment that are orders of magnitude faster than an equivalent full Q-tensor code. We illustrate this principle by discussing the case of a pure liquid crystal with or without flow and the case of a liquid crystal doped with fixed metallic nano-inclusions

    Large Quartz Crystal - Bennett Q.

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    Large Quartz Crystal - Bennett Q.https://digitalmaine.com/mgs_geologic_field_photos/6864/thumbnail.jp

    Morganite Beryl crystal - Bennett Quarry

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    Morganite Beryl crystal - Bennett Quarryhttps://digitalmaine.com/mgs_geologic_field_photos/6847/thumbnail.jp

    Large Quartz Crystal - Bennett Q.

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    Large Quartz Crystal - Bennett Q.https://digitalmaine.com/mgs_geologic_field_photos/6864/thumbnail.jp

    Morganite Beryl Crystal - Bennett Q.

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    Morganite Beryl Crystal - Bennett Q.https://digitalmaine.com/mgs_geologic_field_photos/6902/thumbnail.jp

    Big morganite crystal from Bennett Quarry.

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    Big morganite crystal from Bennett Quarry.https://digitalmaine.com/mgs_geologic_field_photos/6778/thumbnail.jp

    Cassiterite Crystal (3.5 x 2.5 ) - Bennett Q.

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    Cassiterite Crystal (3.5 x 2.5 ) - Bennett Q.https://digitalmaine.com/mgs_geologic_field_photos/6925/thumbnail.jp

    Modeling large air fraction holey optical fibers

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    We develop a modal decomposition approach to solve the full vector wave equation for holey optical fibers (HF). This model can be used to explore the modal properties of a wide range of HFs, including those with large air holes. The optical properties of HF can be tailored via the arrangement of the air holes, and this flexibility leads to a wide range of practical applications
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