Independent tuning of double plasmonic waves in a free-standing graphene-spacer-grating-spacer-graphene hybrid slab

Abstract

The independent excitation and tuning of double plasmonic waves are realized in a free-standing graphene-spacer-grating-spacer-graphene (GSGSG) hybrid slab, which consists of two graphene field effect transistors placed back-to-back to each other. Resulted from the high transparency and the tight confinement of surface plasmonic mode for the graphene, double plasmonic waves can be independently excited by guided-mode resonances (GMRs). Theoretical and numerical investigations are performed in the mid-infrared band. Furthermore, the tuning of individual GMR resonant wavelengths with respect to the system parameters is studied. The results provide opportunities to engineer the proposed hybrid slab for wavelength selective and multiplexing applications.

Tunable Terahertz Metamaterials Based on Anapole Excitation with Graphene for Reconfigurable Sensors

“…18 Graphene can achieve ultrawide band tunability by controlling electromagnetic fields or chemical doping due to its semimetal property. 19 A graphene-based split-ring resonator on the SiO 2 / Si substrate has been investigated by Wang et al, showing frequency tunability and amplitude modulation. 20 Dong et al demonstrated a sandwich graphene metamaterial in the THz region that could evaluate the dominant magnetic-vortex toroidal responses.…”

“…The rapid development of graphene optoelectronics is expected to make up for this vacancy . Graphene can achieve ultrawide band tunability by controlling electromagnetic fields or chemical doping due to its semimetal property . A graphene-based split-ring resonator on the SiO 2 /Si substrate has been investigated by Wang et al, showing frequency tunability and amplitude modulation .…”

Tunable Extraordinary Optical Transmission with Graphene in Terahertz

“…19−26 The Fermi energy of graphene can be modulated conveniently by applying an external voltage, which achieves ultrawideband tunability by controlling electromagnetic fields. 19 Gao et al 20 realized high-contrast, terahertz-wave modulation using gated graphene and based on extraordinary transmission through ring apertures. Wang et al 25 achieved active tuning of the analogue of electromagnetically induced transparency effects by integrating monolayer graphene into all-dielectric metamaterials in THz.…”

“…Moreover, according to evolving requirements in applications, there is an ever-growing desire for adjustable EOT. Intriguingly, the unique tuning properties of graphene in the THz band have captured widespread attention. − The Fermi energy of graphene can be modulated conveniently by applying an external voltage, which achieves ultrawideband tunability by controlling electromagnetic fields . Gao et al realized high-contrast, terahertz-wave modulation using gated graphene and based on extraordinary transmission through ring apertures.…”

Tunable mid-infrared ultra-narrowband plasmonic absorber and sensor based on bulk Dirac semimetal metamaterials

“…The discovery of a series of new materials, such as graphene, black phosphorus and borophene, have overcome this issue. [18][19][20][21][22][23] The absorption wavelength of the perfect absorber can be dynamically tuned without reoptimizing the geometric parameters of the structure by adjusting its Fermi energy 24) via introducing graphene into the perfect absorber. [25][26][27][28][29][30] Most recently, bulk Dirac semimetals (BDS) have attracted great interest among researchers.…”