Extremely low scattering cross section of a perforated silver film

With a perforated silver film, we demonstrate that an extremely low scattering cross section with an efficiency of less than 1% can be achieved at tunable wavelengths with tunable widths. The resonance wavelength, width, and intensity are influenced by the size, shape, and arrangement pattern of the holes, as well as the distance separating the holes along the polarization direction. The discovered phenomenon holds promise for the development of photovoltaic devices with improved energy conversion efficiency.