Terahertz wavefront manipulating by double-layer graphene ribbons metasurface

Hong-liang, Zhao; Chen, Zhihong; Su, Fei; Ren, Guangjun; Liu, Fei; Yao, Jianquan

doi:10.1016/j.optcom.2017.06.044

Cited by 31 publications

(16 citation statements)

References 27 publications

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“…1(a), consists of a graphene ribbons array covered by ion-gel film, a dielectric gap layer, and a metal mirror. The high capacitance ion-gel is employed to tune the Fermi level of the graphene [26]. In the design of functional metasurface, it is highly desired that the phase shift of the reflected light can be varied in a large extent, and the ideal case is from −π to π.…”

Section: Resultsmentioning

confidence: 99%

Spectrally and Spatially Tunable Terahertz Metasurface Lens Based on Graphene Surface Plasmons

et al. 2018

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In this paper, we propose a spectrally and spatially tunable terahertz metasurface lens based on the surface plasmons of graphene ribbons. By tuning the graphene Fermi energy, the optical property of graphene surface plasmons can be dynamically modulated, leading to tailored abrupt phase shifts of the reflected light. We demonstrate a resulting large spectral tuning range from 4 to 6 THz for the proposed metasurface lens with a spatially adjustable focal point in tens of micrometers. The influence of electron relaxation time of graphene and thickness of ion-gel on the performance of the metasurface lens is also discussed. Such a terahertz metasurface lens with a large spectral and spatial tunability is expected to show the great potentials in realizing active terahertz elements.

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Section: Resultsmentioning

confidence: 99%

Spectrally and Spatially Tunable Terahertz Metasurface Lens Based on Graphene Surface Plasmons

et al. 2018

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“…[12,25] Polarization independent Ref. [20][21][22][23][24] X-polarization This work Polarization dependent…”

Section: Literature Characteristicsmentioning

confidence: 96%

“…Among various metasurfaces, metalens with its unit cell interacting with incident light and introducing abrupt phase shift along the interface of the metasurface have been widely presented to achieve the function of focusing [12,13] and anomalous reflection [14][15][16]. Lots of models like the nanoslit [17], nanohole [18,19], and graphene ribbons [20][21][22][23][24] have been introduced in metalens design, where 2π phase shift resulting from the designed antennas is needed in controlling the wavefront. Although a polarization-independent metalens [12,25] and polarization-conversion metalens [26] have been reported in former works, and the designed metalenses are always adjusted to manipulate different kinds of incident waves with various structures [27][28][29][30], the metalens, with its function controlled by incident polarization state [31,32], has not been fully investigated.…”

Section: Introductionmentioning

confidence: 99%

Polarization Controlled Dual Functional Reflective Planar Metalens in Near Infrared Regime

et al. 2020

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The metalens has been a hotspot in scientific communications in recent years. The polarization-controlled functional metalens is appealing in metalens investigation. We propose a metalens with dual functions that are controlled by polarization states. In the first design, when applied with x-and y-polarized light, two focal spots with different focal lengths are acquired, respectively. The proposed metalens performs well when illuminated with adjacent wavelengths. In the second design, the reflected light is focused when applied with x-polarized light, and when applied with y-polarized light, the reflected light is split into two oblique paths. We believe that the results will provide a new method in light manipulation.

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“…In addition, the metasurface is endowed with increased power when more complicated graphene elements and the corresponding gate configuration are considered. For example, when two graphene patches are combined in a unit cell in-plane [62] or stacked on top of the substrate with individual gate control [63], the wavefront engineering has been studied with an increased bandwidth. Taking advantage of the highly-confined surface plasmon in graphene, a dual-band focusing lens is proposed by stacking two layers of graphene nanoribbons above the gold reflector with negligible crosstalk [64].…”

Section: Phase Modulation In Graphene Metasurfacesmentioning

confidence: 99%

Recent Progress on Graphene-Functionalized Metasurfaces for Tunable Phase and Polarization Control

2019

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The combination of graphene and a metasurface holds great promise for dynamic manipulation of the electromagnetic wave from low terahertz to mid-infrared. The optical response of graphene is significantly enhanced by the highly-localized fields in the meta-atoms, and the characteristics of meta-atoms can in turn be modulated in a large dynamic range through electrical doping of graphene. Graphene metasurfaces are initially focused on intensity modulation as modulators and tunable absorbers. In this paper, we review the recent progress of graphene metasurfaces for active control of the phase and the polarization. The related applications involve, but are not limited to lenses with tunable intensity or focal length, dynamic beam scanning, wave plates with tunable frequency, switchable polarizers, and real-time generation of an arbitrary polarization state, all by tuning the gate voltage of graphene. The review is concluded with a discussion of the existing challenges and the personal perspective of future directions.

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Terahertz wavefront manipulating by double-layer graphene ribbons metasurface

Cited by 31 publications

References 27 publications

Spectrally and Spatially Tunable Terahertz Metasurface Lens Based on Graphene Surface Plasmons

Spectrally and Spatially Tunable Terahertz Metasurface Lens Based on Graphene Surface Plasmons

Polarization Controlled Dual Functional Reflective Planar Metalens in Near Infrared Regime

Recent Progress on Graphene-Functionalized Metasurfaces for Tunable Phase and Polarization Control

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