Abstract
In this work, a double-deck structure consisting of graphene nanoribbons is proposed, and the plasmonic properties of the system is investigated at mid-infrared wavelengths. In the structure, two graphene nanoribbon arrays with different parameters are coated on both sides of a glass substrate. With respectively varying the Fermi energies, the layer numbers of the graphenes, and the widths of the ribbons, the light transmittance is studied in the wavelength region from 5 to 30\(\mu\)m, via the finite difference time domain method. Multiple plasmonic resonances are revealed in the double-deck graphenes. It is shown that the plasmonic resonance properties including the resonance wavelengths, the peak intensities, and the peak widths can be adjusted by changing the parameters of the graphenes. The double-deck graphene nanoribbon structure proposed in this work may be implemented in designs of plasmonic devices in mid-infrared regime.
Highlights
Existing plasmonic devices that are based on conventional materials usually have a relatively low performance of either slow response time or limited tunability[1,2,3]
It has been shown that the characteristics of the plasmonic wave depends on the properties of graphene nanoribbons, it is worthwhile to probe the double-deck system, by varying the graphene parameters including the Fermi energy, the layer number, and the ribbon width
A double-deck structure composed of graphene nanoribbons has been proposed, and the plasmonic charateristics have been investigated
Summary
Existing plasmonic devices that are based on conventional materials usually have a relatively low performance of either slow response time or limited tunability[1,2,3]. Graphene-related plasmonic structures and devices that operate in the mid-infrared regime have drawn great attention, since this wavelength range is important in many promising applications, including sensing, imaging, remote detecting, THz antennas, as well as optical spectroscopy[11,12,13]. In the mid-infrared regime, the plasmonic wavevector is much larger than that of the incident light, causing a highly confined electric field[15] To overcome this great mismatch under the irradiation of the midinfrared incident light, array structures consisting of graphene nanoribbons were proposed. Composite arrays of graphene ribbons were investigated, and the tunability of plasmonic resonance in the mid-infrared wavelength range was domenstrated[17]. We propose a graphene nanoribbon based double-deck structure, and demonstrate the tunability of plasmonic resonances revealed in the light transmittance curve in the mid-infrared wavelength region from 5 to 30μm
Sign-in/Register to view highlights & summary 
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call