Abstract
We propose a special structure of the hyperbolic metamaterial (HMM) in terahertz frequency range that is composed of graphene-dielectric multilayer fishnet and silicon-dielectric nanowire. The results based on the full-wave numerical simulation show that the proposed metamaterial can exhibit Type I or Type II hyperbolic behavior at some special frequency ranges and can also realize the optical topological transition by tuning the frequency or the bias voltage. The dynamical tunability of the permittivity with the applied voltage is analyzed at the specific frequencies of 2.8 THz and 4.5 THz. The geometry of the dispersion relation of the designed metamaterial can be mutually converted between the hyperbolic and elliptical geometry when the bias voltage changes. Moreover, the difference between the vacuum background and the proposed effective medium at different frequencies is also analyzed with the comparison of the corresponding isofrequency surfaces. The proposed metamaterial may be expected to provide many tunable facilities in the optical topological transitions and the field of THz technologies.
Highlights
The past three decades have witnessed the revolutionary development of terahertz (THz) science and technologies with vast range of unique applications include imaging,1 biosensing2 and spectroscopy.3 The study of materials and devices for the generation, detection and regulation of waves in the THz frequency range has always been the focus of THz research
We propose a special structure of the hyperbolic metamaterial (HMM) in terahertz frequency range that is composed of graphene-dielectric multilayer fishnet and silicon-dielectric nanowire
The results based on the full-wave numerical simulation show that the proposed metamaterial can exhibit Type I or Type II hyperbolic behavior at some special frequency ranges and can realize the optical topological transition by tuning the frequency or the bias voltage
Summary
The past three decades have witnessed the revolutionary development of terahertz (THz) science and technologies with vast range of unique applications include imaging, biosensing and spectroscopy. The study of materials and devices for the generation, detection and regulation of waves in the THz frequency range has always been the focus of THz research. The study of materials and devices for the generation, detection and regulation of waves in the THz frequency range has always been the focus of THz research. Functional devices such as lenses, filters, and modulators in the THz band do not exist because many materials have low response to intra-band radiation at this frequency.. The propagation of electromagnetic wave can be controlled by adjusting the structural units of metamaterials, providing an effective way to realize THz functional materials and devices.. Motivated by the novel nature of the OTT we present a new composite metamaterial based on the graphene components that can realize the OTT by tuning the frequency in the THz range. This tunable metamaterial may have various promising applications in the terahertz fields
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