Smart optical cross dipole nanoantenna with multibeam pattern

Abstract

In this paper, an optical smart multibeam cross dipole nano-antenna has been proposed by combining the absorption characteristic of graphene and applying different arrangements of directors. By introducing a cross dipole nano-antenna with two V-shaped coupled elements, the maximum directivity of 8.79 dBi has been obtained for unidirectional radiation pattern. Also, by applying various arrangements of circular sectors as director, different types of radiation pattern such as bi- and quad-directional have been attained with directivities of 8.63 and 8.42 dBi, respectively, at the wavelength of 1550 nm. The maximum absorption power of graphene can be tuned by choosing an appropriate chemical potential. Therefore, the radiation beam of the proposed multibeam cross dipole nano-antenna has been controlled dynamically by applying a monolayer graphene. By choosing a suitable chemical potential of graphene for each arm of the suggested cross dipole nano-antenna without the director, the unidirectional radiation pattern shifts ± 13° at the wavelength of 1550 nm. Also, for the multibeam nano-antenna with different arrangements of directors, the bi- and quad-directional radiation patterns have been smartly modified to uni- and bi-directional ones with the directivities of 10.1 and 9.54 dBi, respectively. It is because of the graphene performance as an absorptive or transparent element for different chemical potentials. This feature helps us to create a multipath wireless link with the capability to control the accessibility of each receiver.

Theoretical analysis of a graphene quantum well hybrid plasmonic waveguide to design an inter/intra-chip nano-antenna

“…Recently, multi-beam reconfigurable plasmonic nano-antennas based on graphene have attracted tremendous attention due to the unique features of graphene as a promising two-dimensional (2D) monoatomic layer of carbon atoms in optical and terahertz (THz) frequency range for electronic and photonic applications [3,[23][24][25][26][27]. Graphene with its inherent tunability is a good candidate for reconfigurable and intelligent multi-beam nano-antennas because of its high conductivity and little skin effect in THz spectrum and high absorptive feature in visible and near-infrared spectra [25,28].…”

“…Up to now, graphene-based reconfigurable THz antennas have been widely investigated [29][30][31], but limited studies have been done on graphene-based nano-antennas especially graphene HPWAs for operating at telecommunication wavelengths. In [24] a smart multi-beam cross-dipole nano-antenna has been proposed and shown that by applying different chemical potentials of graphene at the wavelength of 1550 nm the direction of radiation pattern can be controlled easily due to the absorptive and transparent specifications of graphene.…”

Graphene-based plasmonic nanoantenna with trapezoidal structure in THz band

“…The referred-to electromagnetic resonances are called surface plasmon polaritons (SPP). The surface plasmon polaritons are related to the transition of electrons in the energy band [21]. The phenomenon results in the diffusion of intense light and increased absorption of a localized electromagnetic field [22].…”

Giant localized electromagnetic field of highly doped silicon plasmonic nanoantennas

“…With recent technological advances, it is now possible to establish nanodevices and subwavelength structures with adequate precision. These nanostructures can include nanoantennas, plasmonic devices, metamaterials, and terahertz filters 2 , 3 . Plasmonic devices direct and control light at a metal/dielectric interface.…”