Broadband Tunable Polarization Converter Realized by Graphene-Based Metamaterial

Yu, Xingyang; Gao, Xi; Qiao, Wei; Wen, Lili; Yang, W. L.

doi:10.1109/lpt.2016.2596843

Cited by 110 publications

(30 citation statements)

References 24 publications

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“…Due to its unique electrical and optical properties in the terahertz and mid-infrared regimes, many intriguing applications have been proposed, such as the optical devices, plasmon waveguiding, clocking devices and many other optoelectronic applications. Compared with metal plasmonics with restricted flexible permittivity, the most remarkable advantage of the graphene is its capability of dynamically tuning the conductivity through straightforward chemical or electrostatic gatings, which opens the door to many exciting tunable devices, such as tunable absorbers [24][25][26][27][28][29][30], and tunable polarization converters [31][32][33][34][35][36][37][38][39][40]. For example, Cheng et al proposed a dynamically tunable broadband cross polarization converter (CPC) made of L-shaped graphene sheets, which transformed linear light into cross polarization light for a single band in the midinfrared regions [31].…”

Section: Introductionmentioning

confidence: 99%

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Zhu¹,

Li²,

Deng³

et al. 2018

Opt. Mater. Express

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A new wideband sinusoidally-slotted graphene-based cross-polarization converter (CPC) is proposed in this paper. The proposed polarization converter can realize a broadband terahertz polarization conversion from 1.28 to 2.13-THz with a polarization conversion ratio (PCR) of more than 0.85. Taking advantage of the gradient width modulation of the graphene-based unit structure, the continuous plasmon resonances are excited at the edges of the sinusoidal slot. Therefore, the proposed converter can achieve a broadband polarization conversion in a simplified structure. Furthermore, the polarization conversion characteristics of the CPC are insensitive to the incident angle. The PCR remains more than 0.85 with little bandwidth degradation even as the incident angle increases to as high as 50°. More importantly, the operating bandwidth and the magnitude of the PCR can be tuned easily by adjusting the chemical potential and the electron scattering times of the graphene. In a way, we believe this kind of graphene-based polarization converter can enrich the polarization conversion community for realizing broadband and tunable polarization conversion.

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Section: Introductionmentioning

confidence: 99%

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Zhu¹,

Li²,

Deng³

et al. 2018

Opt. Mater. Express

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show abstract

“…In 2016, Yu et al [67] proposed a wideband tunable polarization converter working in THz region reflection mode, which is realized by a hybrid metamaterial that consists of an I-shaped metal resonator and a double-layer graphene sheet. They found that, by changing the Fermi energy of graphene, the phase difference between the two orthogonal polarized components could be adjusted over a large range.…”

Section: Graphene Thz Polarizermentioning

confidence: 99%

Review of Polarization Optical Devices Based on Graphene Materials

Zhang

Xing

2020

IJMS

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Graphene has received extensive scholarly attention for its extraordinary optical, electrical, and physicochemical properties, as well as its compatibility with silicon-based semiconductor processes. As a unique two-dimensional atomic crystal material, graphene has excellent mechanical properties, ultra-high carrier mobility, ultra-wide optical response spectrum, and strong polarization dependence effect, which make it have great potential in new optical and polarization devices. A series of new optical devices that are based on graphene have been developed, showing excellent performance and broad application prospects. In this paper, the recent research progress of polarizers, sensors, modulators, and detectors that are based on the polarization characteristics of graphene is reviewed. In particular, the polarization dependence effect and broadband absorption enhancement of graphene under total reflection structure are emphasized, which enhance the interaction between graphene and light and then provide a new direction for research of graphene polarization devices.

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“…However, it is more inspiring to dynamically manipulate the process of polarization conversions. By integrating graphene and anisotropy metasurfaces, the graphene‐loaded metasurfaces can dynamically modulate the polarization states of electromagnetic waves with a widely tunable range by electrically changing the Fermi energy of the graphene sheets . A more straightforward strategy can be applied in terahertz range, since the few‐layer metasurfaces are large enough to make mechanical manipulation possible .…”

Section: Prominent Applications In Few‐layer Metasurfacesmentioning

confidence: 99%

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Chen

Zhang

et al. 2019

Advanced Optical Materials

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applications have been realized based on the metamaterials, such as negative index materials, [3] invisibility cloaks, [4] and zeroindex materials. [5] Nevertheless, metamaterials are usually bulky, difficult to be fabricated, and suffer from high energy losses, which hinder their practical applications in modern photonic systems. In recent years, planar metasurfaces, the 2D equivalents of metamaterials, have attracted plenty of attentions due to their extraordinary abilities in controlling the polarization, amplitude, phase, and dispersion of electromagnetic waves. [6][7][8] Compared with bulk metamaterials, the metasurfaces have many advantages, such as ultrathin thicknesses, low losses, ease of fabrication and integration. Over the past years, single-layer metasurfaces have been widely applied in realizing polarization conversion, [9] beam deflectors, [10,11] metalenses, [12,13] holograms, [14] coding, [15] structural colors, [16,17] nonlinear metasurfaces, [18] and some other applications. Nevertheless, the interactions between lights and ultrathin single-layer metasurfaces are usually limited, resulting in low efficiency and limited controllability in some applications. [19] Moreover, the degrees of freedom for light manipulation provided by a single-layer metasurface are usually not enough in realizing multifunctional devices and some other sophisticated photonic systems.Few-layer metasurface that contains more than one functional layer provides an effective method to overcome the drawbacks of both bulk metamaterials and single-layer metasurfaces. Cheng et al. employed the concept of few-layer metasurfaces to discuss the advantages and emergent functionalities of them in ref. [20]. Few-layer metasurfaces retain the advantages of single-layer metasurfaces and can provide more degrees of freedom to manipulate electromagnetic waves. More importantly, the abundant layer effects, such as the multiple wave interference between layers and the near-field coupling effects, can enhance the interactions between lights and structures and improve the efficiency of few-layer systems. In addition, the combination of different functional layers can produce novel functions that single-layer metasurfaces can hardly realize. For example, by breaking the mirror symmetry along the propagation direction, few-layer metasurfaces can realize asymmetric transmission of linearly polarized lights. [21] By vertically integrating different metasurfaces on one substrate, optical systems with different functions can be miniaturization and integration. Recently, the few-layer metasurfaces have also been extended in the acoustic fields to realize some novel applications, such Metamaterials are 3D artificial structures proposed to surpass conventional natural materials and realize novel functions beyond traditional optical elements. Nevertheless, they are usually bulky and difficult to be fabricated. As 2D equivalents of metamaterials, metasurfaces have been proposed to overcome the drawbacks of metamaterials and fully control the polarizati...

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Broadband Tunable Polarization Converter Realized by Graphene-Based Metamaterial

Cited by 110 publications

References 24 publications

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Broadband tunable terahertz polarization converter based on a sinusoidally-slotted graphene metamaterial

Review of Polarization Optical Devices Based on Graphene Materials

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

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