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The sylvanshine: retroreflection from dew-covered trees.

A B Fraser

    Applied Optics
    |October 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The study reveals that dew-covered plants, particularly coniferous trees, exhibit strong retroreflection (sylvanshine) due to high water droplet contact angles. This phenomenon enhances backscattered light significantly, challenging previous explanations of similar optical effects.

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    Area of Science:

    • Plant optics
    • Bioluminescence and optical phenomena

    Background:

    • The heiligenschein, a bright glow on dew-covered grass, is traditionally attributed to plant hairs.
    • This explanation is challenged by the discovery of sylvanshine, a similar retroreflection phenomenon observed on hairless plants.

    Purpose of the Study:

    • To investigate the optical properties of dew-covered plants, specifically the phenomenon of sylvanshine.
    • To model the relationship between water droplet contact angle and retroreflection intensity in plants.

    Main Methods:

    • Development of a simple physical model to simulate light scattering from dew droplets on plant surfaces.
    • Analysis of the relationship between contact angle and backscatter enhancement.

    Main Results:

    • Retroreflection enhancement is minimal below a 90° contact angle, similar to diffuse surfaces.
    • As the contact angle increases to 140°, retroreflection enhancement rises by two orders of magnitude.
    • Coniferous trees, with their typically larger contact angles, exhibit brilliant sylvanshine.

    Conclusions:

    • Plant hair is not essential for strong retroreflection; water droplet geometry is key.
    • Sylvanshine is a significant optical phenomenon in certain plant species, notably conifers.
    • The contact angle of dew droplets on plant surfaces is a critical factor in determining retroreflection intensity.