Plasmonic absorption characteristics based on dumbbell-shaped graphene metamaterial arrays

Abstract

In this paper, we proposed a theoretical model in the far-infrared and terahertz (THz) bands, which is a dumbbell-shaped graphene metamaterial arrays with a combination of graphene nanorod and two semisphere-suspended heads. We report a detailed theoretical investigation on how to enhance localized electric field and the absorption in the dumbbell-shaped graphene metamaterial arrays. The simulation results show that by changing the geometrical parameters of the structure and the Fermi level of graphene, we can change the absorption characteristics. Furthermore, we have discovered that the resonant wavelength is insensitive to TM polarization. In addition, we also find that the double-layer graphene arrays have better absorption characteristics than single-layer graphene arrays. This work allows us to achieve tunable terahertz absorber, and may also provide potential applications in optical filter and biochemical sensing.

Terahertz Metalens for Multifocusing Bidirectional Arrangement in Different Dimensions

“…Then, invariable structural parameters can be further determined by setting initial parameters of SSR and optimizing the period of unit cell, thickness of silicon substrate and grating parameters in the simulation software. Due to gold is the reflective metal, and the interaction between the metal and the dielectric layers will excite surface plasmon polaritons (SPP) waves, which will lead to ohmic loss [26]- [28]. Therefore, we choose gold grating as a polarizer, which can effectively improve the transmission efficiency of cross-polarized light and suppress reflection and absorption.…”

Tunable Graphene-based Plasmonic Perfect Metamaterial Absorber in the THz Region

“…Whether through the development of terahertz technology [1,2,3,4] or the development of perfect absorbers [5,6,7], the emergence of metamaterials has undoubtedly played a role in promoting them. Although terahertz technology has made rapid progress in light sources and detectors [8,9,10,11], it still needs further exploration and research compared with the mature infrared and microwave bands. However, if we want to continue to develop terahertz (THz) technology, we need to solve a difficult problem: finding a kind of material that can strongly respond to the terahertz band.…”

A Tunable Plasmonic Refractive Index Sensor with Nanoring-Strip Graphene Arrays

“…More interestingly, the electric field, magnetic field, and chemical doping can effectively adjust the surface conductivity of graphene [19,20]. Due to its unique electrical and optical properties [21,22], it has been widely used in the fields of transparent electrode [23,24,25], light modulator [26,27], and photoelectric detector [28,29,30], and has great potential for development in these fields.…”