Single Step Fabricated Low Cost and Flexible Fano Resonant All-Metal Plasmonic Metasurface Absorber

In this letter, we experimentally demonstrate the absorption of near -infrared light by a one-dimensional (1D) Fano resonant all-metal plasmonic metasurface (APM). The low cost, flexible and reusable APM was obtained by transferring the 1D patterned plasmonic nanostructure made of Al from a compact disk on a transparent scotch tape. Control experiments on the variation of angle of incidence of light were performed to achieve the maximum light absorption, followed by polarization, reusability, and refractive index (RI) dependent sensing performance of the APM absorber (APMA). Electric field profiles at different incidence angles were simulated using finite element method (FEM) to explain the interaction of light with the APMA. Absorption of light is possible because of its confinement at the sharp edges of plasmonic nanostructure due to the SP modes generated at the metal air interface. APMA supports RI sensing characteristics with a maximum sensitivity of 1216.85 nm/RIU. APMA can be used to develop cost effective photonic devices such as sensors, spectral filters, heat absorbing protective photonic covers, etc.