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A device for self-tracking a light source, including a focusing optical device configured to focus incoming light to a focal spot, an adaptive device configured to reflect the light of the focal spot and arranged to provide for a phase change at an area of the focal spot of the incoming light to generate a reflected light, and a light guide located between the focusing optical device and the adaptive device, the light guide configured to capture the reflected light of the adaptive device.
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Michael Graetzel, Shaik Mohammed Zakeeruddin, Fan Fu, Hongwei Zhu, Chunyang Zhang