Plasmonic Metamaterial Absorber Based on MIM Structure for THz Detection

Abstract

Abstract In this paper, the absorber is designed and analyzed based on Metal-Insulator-Metal (MIM) structure and the main idea of this design is to create a different geometric structure on the upper metal layer to create absorption resonance at different frequencies and bring these resonances closer to each other to have an absorption spectrum. The absorber of the studied materials is composed of metal-dielectric-metal layers, in which gold is used in the upper and lower metal layers and alumina is used for the dielectric material between them. The thickness of the bottom, dielectric and top layers is 1600 nm, 560 nm, and 600 nm, respectively, and the unit cell dimensions of this adsorbent are 9800 nm. The general purpose of studying this structure was to generalize it to the terahertz frequency range and to create an absorption of nearly 100% in the frequently used frequency range below 100 Terahertz., we used the Meander line structure, which is essentially a Nanoantenna structure to amplify and intensify the magnetic field in the absorber.