Plasmon-induced transparency in an air–dielectric grooved parallel-plate terahertz waveguide

Abstract

In this paper, we examine the plasmon-induced transparency (PIT) effect in a parallel-plate waveguide comprising two similar pyramidal-shaped grooves. One of the grooves is filled with air, while the other is filled with a dielectric material whose refractive index can be varied. The resonant frequencies corresponding to the air and dielectric grooves in the proposed configuration result in the transparency window, which can be modulated with the refractive index of the dielectric material. The approach provides flexibility to control the transparency effect in a waveguide configuration without changing the physical dimensions. We examined field profiles in the transparency region to clearly depict the PIT effect. We have employed an analytical model based upon the three-level plasmonic model to validate our numerical findings. Further, we examined the switching and tunability of the transparency effect by including silicon layers between the grooves, whose conductivity can be varied. The tunable response in the PIT effect in terahertz waveguides can be significant in the construction of terahertz waveguide components.

Terahertz Resonances of Transverse Standing Waves in a Corrugated Plate Waveguide

“…Among them, the THz waveguide transmission technology with low loss, long distance, and low dispersion is very essential due to the signal distortion in free space, the attenuation caused by atmospheric scattering, and the water vapor absorption. Various THz waveguides have been proposed and investigated, such as hollow metallic structures [20], metal wires [21], dielectric waveguides [22], parallel plate structures [23], photonic crystal fibers [24], [25], rectangular structures [26], plasmonic [27], and tapered waveguide [28]. However, most of researchers focused on the low loss and low dispersion THz waveguides and paid little attention to the transverse standing waves (i.e., the guided wave modes).…”

Toroidal electromagnetically induced transparency based meta-surfaces and its applications

“…This resonant transparency effect in the MM is known as EIT. The transparency window is often modulated actively or passively by changing the geometric parameters of the meta-atoms ( Singh et al., 2009 ; Roy Chowdhury et al., 2013 ; Dhriti et al., 2021 ; Zhu et al., 2013 ; Dong et al., 2010 ). The EIT effect in MMs has raised significant interest over the years.…”

Dynamically tunable multiple plasmon-induced transparency effect based on monolayer graphene structure system with rectangular defect cavities

“…In addition, since the development of metamaterials [4][5][6][7], plasmon-induced transparency (PIT) has become the major research area [8][9][10]. The PIT accounts for the transparent result stemming from destructive interference between bright and dark modes, standing for direct and indirect excitation pathways, respectively [11,12]. Usually, the bright mode also presents the full width at half maximum (FWHM) on the absorption spectrum, which researchers can potently combine with incident light.…”