In this paper, we propose a broadband nanoantenna for solar energy harvesting, whose elements compose of dual triangles, a hexagonal pillar and a ring column. The optical characteristics are analyzed numerically by the three dimensional finite-difference time-domain (FDTD) method. It is found that the average absorptivity of the nanostructure is 84.53% in the visible and near-infrared waveband raning from 400-1800nm. In addition, the prefect light absorbing capability is independent of the incident light polarization state, and it can keep up an average absorptivity of 86% for an incident angle as large as ±60°. We attribute the better absorption property of the nanoantenna to Fabry-Perot resonance, lighting-rod effects and the localized surface plasmon resonance enhancement.
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