THz dynamically controllable graphene Y-circulator

Dmitriev, Victor; Castro, Wagner; Nascimento, Clerisson

doi:10.1109/imoc.2017.8121025

“…The width of the graphene strips w and the gap g between the resonator and the strips shown in Fig.1 also affect the resonance frequencies but to a lesser degree. This problem has been discussed in detail in [33] for the case of graphene three-port circulators based on disk resonator.…”

Section: Discussionmentioning

confidence: 99%

Tunable THz and Infrared Plasmonic Filters and Switches Based on Circular Graphene Resonator With 90$^\circ$ Bending of Output Port

Dmitriev

¹

,

Melo

²

,

Castro

³

2020

Self Cite

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Two types of novel graphene-based components, namely, filters and electro-optical switches in guided wave configuration are suggested and analysed. The filters differ from the known ones with collinear orientation of the input and output waveguides by geometry and symmetry. The components consist of a circular graphene disk and two nanoribbons oriented at 90 • to each other in the plane of the graphene layer. The graphene elements are placed on a dielectric substrate. We show that change in symmetry leads to a drastic change in the properties of the components. The physical principle of the devices is based on the dipole, quadrupole and hexapole resonances in the graphene disk which define stop-band, pass-band and stop-band frequency characteristics, respectively. A combination of stop-band and pass-band filter properties by shifing the electronic Fermi level allows one to design a switch. Numerical simulations show that the suggested components have very small dimensions, good characteristics and provide a dynamic control of their central frequency via electrostatic gating.

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“…1 also affect the resonance frequencies but to a lesser degree. This problem has been discussed in detail in [30] for the case of graphene three-port circulators based on disk resonator.…”

Section: Discussionmentioning

confidence: 99%

Tunable THz and infrared plasmonic filter and switches based on circular graphene resonator with 90° bending of output port

Dmitriev,

Melo,

Castro

2019

Preprint

Self Cite

0

View full text Add to dashboard Cite

Two types of novel graphene-based components, namely, filters and electro-optical switches in guided wave configuration are suggested and analysed. The filters differ from the known ones with collinear orientation of the input and output waveguides by geometry and symmetry. The components consist of a circular graphene disk and two nanoribbons oriented at 90 • to each other in the plane of the graphene layer. The graphene elements are placed on a dielectric substrate. We show that change in symmetry leads to a drastic change in the properties of the components. The physical principle of the devices is based on the dipole, quadrupole and hexapole resonances in the graphene disk which define stop-band, pass-band and stop-band frequency characteristics, respectively. A combination of stop-band and pass-band filter properties by shifing the electronic Fermi level allows one to design a switch. Numerical simulations show that the suggested components have very small dimensions, good characteristics and provide a dynamic control of their central frequency via electrostatic gating.

show abstract