Importance

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Abstract

In various embodiments described herein, a device comprising one or more light guides that is optically coupled to one or more photocells is described. The device further comprises one or more light turning films or layers comprising volume or surface diffractive features or holograms. Light incident on the light guides is turned by volume or surface diffractive features or holograms that are reflective or transmissive and guided through the light guides by multiple total internal reflections. The guided light is directed towards the photocells. In certain embodiments, solar energy is also used to power or heat a thermal generator to heat water or produce electricity from steam. Various embodiments may comprise an air gap or an optical isolation layer disposed between the multiple light guides.

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First Claim