Evaluating the Effect of Abiotic Stresses on Levels of H2O2 and Ascorbate Peroxidase in Eruca sativa mill

Abstract

Metamaterials are synthetic two-dimensional metasurfaces exhibiting electromagnetic responses not found in natural materials, such as negative permittivity and permeability. These materials, with varying structures and sizes, possess unique properties, leading to a wide range of applications in biomedicine, optical devices, and other fields. A terahertz metamaterial absorber is a device that utilizes metamaterials in the terahertz band, designed to match free-space impedance and effectively achieve "perfect absorption" of incident electromagnetic waves within a specific frequency range. In this paper, we design a "Sichuan" metal-dielectric-metal "sandwich" type terahertz metamaterial absorber. Using finite element simulation software for modeling and optimization, we achieve an optimal resonant absorption peak of 2.84 THz between 1 and 3 THz, with 99.93% absorption efficiency at this frequency. To further enhance the functionality of the terahertz metamaterial absorber, we combine it with gold nanoparticles (30 nm to 70 nm in size), randomly grown on the surface of its metal bands. Simulation results indicate that the presence of these small gold nanoparticles does not diminish the absorber's response in the terahertz band. Additionally, studying individual gold nanoparticles on the multi-level structure of metamaterials in the visible light band reveals that the structure responds across the entire visible spectrum, with an enhancement factor above 10^4. Consequently, the multi-level structure of the metamaterial demonstrates responsiveness in both the terahertz and visible light bands, significantly expanding the application potential of terahertz metamaterial absorbers