Solar power conversion system. The system includes a cavity formed within an enclosure having highly specularly reflecting in the IR spectrum inside walls, the enclosure having an opening to receive solar radiation. An absorber is positioned within the cavity for receiving the solar radiation resulting in heating of the absorber structure. In a preferred embodiment, the system further contains an energy conversion and storage devices thermally-linked to the absorber by heat conduction, convection, far-field or near-field thermal radiation.
 This invention was made with government support under Grant Nos. DE-EE0005320, DE-SC0001299 and DE-FG02-09ER46577 awarded by the Department of Energy. The government has certain rights in this invention.