Beam-scanning planar lens based on graphene

Xu, Hong; Lu, Wei; Jiang, Yun; Dong, Zheng‐Gao

doi:10.1063/1.3681799

Cited by 57 publications

(10 citation statements)

References 23 publications

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“…Recently, large-area graphene has been fabricated, 1,2 allowing for graphene plasmonic applications in the farthrough near-infrared range of frequencies. Graphene has been proposed for applications such as THz plasmon oscillators, 3 polarizers, 4,5 filters, 6 antennas, 7,8 surface plasmon modulators, 9 and in tunable waveguiding structures and interconnects, [10][11][12][13][14][15][16][17] among a host of other applications such as Fourier optics and beam scanning 18,19 and cloaking. 20 For plasmonic applications there are four important attributes of the surface plasmon (SP): (1) attenuation, (2) propagation constant, (3) mode confinement and field profile, and (4) excitation strength.…”

Section: Introductionmentioning

confidence: 99%

Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support

et al. 2012

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The excitation of transverse magnetic (TM) surface plasmons by a point dipole in the vicinity of a multilayered graphene/dielectric system is examined. It was previously shown that the surface plasmon (SP) excited by a vertical dipole on an isolated graphene sheet exhibits a strong excitation peak in the THz region; here we show that, in the presence of a finite-thickness dielectric support layer such as SiO 2 , considerable spectral content is transferred to a second (perturbed dielectric slab) mode, greatly decreasing and redshifting the excitation peak. The presence of a Si half-space also diminishes the excitation strength, but for graphene on top of SiO 2 -Si the presence of the SiO 2 layer creates a spacer restoring the excitation peak. A two-level quantum emitter is also considered, where it is shown that the addition of a thin dielectric support slab and SiO 2 -Si geometries affects the spontaneous decay rate in a manner similar to the classical dipole SP excitation peak.

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Section: Introductionmentioning

confidence: 99%

Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support

et al. 2012

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“…A variety of graphene-based metasurfaces, with patterned graphene or hybrid graphene-metal composites, have been wildly proved to realize tunable functions such as polarization conversion, antenna emission, perfect absorption and optical transformation [35][36][37][38]. Currently, dynamically tunable metasurfaces based on graphene nanostructures have been demonstrated to manipulate wavefront of terahertz light, whose typical functions are beam steering and active-focusing lensing [39][40][41][42][43]. However, in these designs, the realization of continuously tunable beam azimuths or focal spots can only be based on the individual modulation of Fermi energy of each graphene unit.…”

Section: Introductionmentioning

confidence: 99%

Continuously tunable metasurfaces controlled by single electrode uniform bias-voltage based on nonuniform periodic rectangular graphene arrays

et al. 2020

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Metasurfaces, the two-dimensional artificial metamaterials, have attracted intensive attention due to their abnormal ability to manipulate the electromagnetic wave. Although there have been considerable efforts to design and fabricate beam steering devices, continuously tunable devices with a uniform bias-voltage have not been achieved. Finding new ways to realize more convenient and simpler wavefront modulation of light still requires research efforts. In this article, a series of novel reflective metasurfaces are proposed to continuously modulate the wavefront of terahertz light by uniformly adjusting the bias-voltage. By introducing the innovation of nonuniform periodic structures, we realize the gradient distribution of the reflected light phase-changing-rate which is the velocity of phase changing with Fermi energy. Based on strict phase distribution design scheme, a beam scanner and a variable-focus reflective metalens are both demonstrated successfully. Furthermore, dynamic and continuous control of either the beam azimuth of beam scanner or the focal length of metalens can be achieved by uniformly tuning the Fermi energy of graphene. Our work provides a potentially efficient method for the development and simplification of the adjustable wavefront controlling devices.

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“…Additionally, transformation plasmonics has opened new avenues towards the realization of on-chip nanophotonic devices 13 . In particular, because of its easy fabrication, the uneven ground plane biased structure can be used to realize various terahertz devices, such as “electromagnetic black holes” 25 and “beam-scanning planar lenses” 26 . The uneven ground plane below the dielectric spacer support can be used to easily tune the chemical potential of graphene to achieve desired permittivity patterns.…”

Section: Introductionmentioning

confidence: 99%

Terahertz electromagnetic fences on a graphene surface plasmon polariton platform

Guo

2017

Sci Rep

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Controlling the loss of graphene can be used in the field of transformation optics. We propose a new concept of electromagnetic fence on a monolayer graphene surface plasmon polariton platform. Using a Dot-Density-Renderer quasicrystal metasurface, we can simulate the absorption of gradient index optics structures. Numerical simulations show that the incident waves to our designed electromagnetic fence are trapped toward the central lines and quickly absorbed by the high-loss region. Two basic types of electromagnetic fence and its composite structures have been designed and analyzed, which exhibit excellent broadband absorbing performances at 8 THz–12 THz. Because of its advantages in controlling the soft-boundary effects and easy manufacturing characteristics, the proposed electromagnetic fence seems very promising for THz–frequency-transformation plasmonics applications.

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Beam-scanning planar lens based on graphene

Cited by 57 publications

References 23 publications

Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support

Excitation of terahertz surface plasmons on graphene surfaces by an elementary dipole and quantum emitter: Strong electrodynamic effect of dielectric support

Continuously tunable metasurfaces controlled by single electrode uniform bias-voltage based on nonuniform periodic rectangular graphene arrays

Terahertz electromagnetic fences on a graphene surface plasmon polariton platform

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