Bends and splitters in graphene nanoribbon waveguides

Bends and splitters in graphene nanoribbon waveguides.

We investigate the performance of bends and splitters in graphene nanoribbon waveguides. Although the graphene waveguides are lossy themselves, we show that bends and splitters do not induce any additional loss provided that the nanoribbon width is sub-wavelength. We use transmission line theory to qualitatively interpret the behavior observed in our simulation. Our results pave a promising way...

Broadband sharp 90-degree bends and T-splitters in plasmonic coaxial waveguides.

We demonstrate numerically that sharp 90° bends and T-splitters can be designed in plasmonic coaxial waveguides at deep-subwavelength scale to operate without reflection and radiation over a broad range of wavelengths, including the telecommunication wavelength of 1.55 μm. We explain the principles of the operation using a transmission line model of the waveguide in the quasi-static limit. The ...

Bends in magneto-inductive waveguides

Magneto-inductive (MI) waveguides are periodic structures that operate by magnetic coupling between a set of lumped-element L-C resonators. The effect of waveguide bending on the propagation of MI waves is investigated, and it is shown that discontinuities in axis curvature will typically generate reflections. Changes in the equivalent circuit parameters of two types of MI waveguides (formed fr...

Graphene nanoribbon heterojunctions and heterostructures

Phase coherent transport in graphene nanoribbons and graphene nanoribbon arrays

We have experimentally investigated quantum interference corrections to the conductivity of graphene nanoribbons at temperatures down to 20 mK studying both weak localization (WL) and universal conductance fluctuations (UCFs). Since in individual nanoribbons at milli-Kelvin temperatures the UCFs strongly mask the weak localization feature we employ both gate averaging and ensemble averaging to ...