An Ultrahigh Narrowband Absorber Close to the Information Communication Window

In this paper, we demonstrate a plasmonic ultrahigh narrowband perfect absorber, which realizes an absorption intensity of up to 99.99% in the near-infrared electromagnetic spectrum regime. Different dimensional effects on properties are studied using computer simulation technology (CST) with finite element method (FEM) solver. For both transverse electric (TE) and magnetic (TM) polarization, absorber shows high stability over wide range incident angles. This is attributed synergy effect resonance surface plasmon resonance. Furthermore, sensitivity goes 300 nm/RIU for various refractive indices different analytes. Our proposed working wavelength very close communication window information; therefore, except remarkable sensing abilities, it can also be well utilized optoelectronic applications like optical switching, amplifiers, all-optical modulators.