Comparing the different cases, the absorption cross-section spectra in Figure ) indicate the effectiveness of the antenna-reactor configurations with Au (case A) and GaP (case E) as antennas, in enhancing light absorption in Pt nanoparticles. This absorption is dependent on the lattice resonance position of the antennas, leading to high absorption in the long wavelength region in case A and in the short wavelength region in case E. A comparative picture of the different configurations from cases A to E can be obtained in terms of absorption power per unit mass of Pt. Clearly, the Au + Pt nanoparticle configuration in Case A utilizes a given mass of Pt in the most efficient way in terms of the total light energy captured from the incident irradiation as shown in Figure . In fact, the absorbed power by 3 nm Pt nanoparticles in case A is significantly higher than the total incident power over an area of a 3 nm thick Pt thin-film made from 1 gram of Pt. The catch here is that, for per unit of energy captured by the Pt nanoparticles, 2.63 times that much energy is being absorbed in Au simultaneously, that inevitably thermalizes without any hot carrier activity. As summarized in Table , under AM1.5G illumination, the antenna reactor configuration facilitates a significantly higher per particle total absorption power as compared to any configuration without antenna. Au antennas provide the strongest absorption power for Pt nanoparticles in absolute terms. With lossless dielectric materials like GaP as antenna, the absorption power is relatively lower. However, the energy losses are much lower as well, with 66.9% of the total absorbed energy effectively going to the Pt nanoparticles.