Perfect plasmonic absorber for visible frequency

Unit cell of plasmonic metamaterials designed for optical frequency need to be few 10th of nanometer big which turns their manufacturing cumbersome. Here in this report, we show design and fabrication of a nanocomposite with a routine methods of MEMS/NEMS industry as a tunable metamaterial spanning broad range of spectrum from UV to NIR. It provides the opportunity to realize a perfect plasmonic absorber with a wide-band peak which is polarization insensitive and angle-invariant. Complete absorption of light in the developed metamaterial is originated from the manifold phenomena. Multi-excitation of plasmon resonances, light trapping inside and destructive interference within the layers drop the reflectivity down to zero leading to realization of a perfect plasmonic absorber. The absorption band and intensity cab be adjusted by changing the thickness of the composite, its composition (filling factor) and type of metallic mirror (substrate). Such a straightforward approach for fabrication of tunable plasmonic metamaterials could pave the way for application of nanocomposite in photovoltaics.