NOVELTY - The method involves admitting solar radiation through a solar radiation admitting region including an interior surface, where the solar radiation admitting region is symmetric with respect to a plane parallel to length dimension of a solar radiation absorbing element. A portion of energy present in the admitted solar radiation is absorbed in a solar selective absorber. The absorbed energy is transferred from the solar selective absorber to a heat transfer medium present within the solar radiation absorbing element.    USE - Method for capturing solar energy i.e. heat, from solar radiation impinging on a solar field of a power generating system and reflected from a parabolic trough-shape collector and for converting the heat to electricity.    ADVANTAGE - The method enables utilizing parabolic-trough solar power receivers that are less costly to acquire and maintain, and allow operation at higher temperature. The method enables preventing receivers from vacuum degradation. The method enables providing the receivers with absorptive coatings and other components that are less costly, and simpler to manufacture and operate durably with undiminished or improved energetic efficiency at operating temperatures or higher temperatures, thus lowering levelized cost of energy for concentrating solar power produced using solar parabolic troughs. The method enables utilizing a solar selective coating that does not degrade or oxidize during high temperature operation so as to improve performance of a solar trough-based concentrating solar plant.    DETAILED DESCRIPTION - The heat transfer medium is selected from a group consisting of molten solar salt, molecular silicone-based fluid and steam. The solar selective absorber is a plasmonic nanochain cermet structure.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an advanced cavity receiver including a lenticular aperture cover.    Cavity receiver (1100)    Tubular shell (1102)    Heat-absorbing element (1104)    Aperture (1112)    Aperture cover (1114)