Nano-pillars metasurface modelled for perfect absorption at specific wavelengths in infrared spectral regime

Abstract

In this article we propose a specifically tailored plasmonic metasurface structure which has the possibility to achieve perfect absorption at specific narrow wavelength intervals in infrared spectral domain. Our metasurface is composed of rectangular lattice of cylindrically shaped gold resonators with diameters in the range of hundreds of nanometres patterned on an amorphous silicon substrate. In order to attain absorption selectivity, we performed numerical 3D FDTD studies concerning geometrical parameters of the resonators such as diameter and periodicity of the square lattice. We numerically explored the geometrical space parameters consisting in the diameter and lattice constant for optimizing the absorption spectral characteristics for specific infrared wavelengths. The designed structures can be employed in developing infrared selective emission sources, perfect absorbent metamaterials or gas sensors.