Broadband tunable terahertz polarization converter based on graphene metamaterial

Luo, Shiming; Li, Bin; Yu, Anchi; Gao, Jun; Wang, Xinbing; Zuo, Duluo

doi:10.1016/j.optcom.2017.12.036

Cited by 49 publications

(21 citation statements)

References 42 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%

“…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]. Nanocross has also been used in to efficiently convert the polarization states [32], [34]. Other structures, such as Hollow-Carved "H" Array [41], butterfly-shaped holes [42], have also been demonstrated to be suitable to achieve high polarization conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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%

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

View full text Add to dashboard Cite

show abstract

“…Thanks to the extremely thin thickness of only 0.34 nm, graphene can be regarded as an infinitely thin twodimensional planar material and ignores the edge effect. In the midst of this situation, the surface conductivity δ s (ω, µ c , , T ) based on the Kubo formula [18] are investigated to characterize the peculiar electronic properties of graphene. In general, δ s (ω, µ c , , T ) mainly consists two parts which are intraband contributions δ intra (ω, µ c , , T ) and interband contributions δ inter (ω, µ c , , T ), respectively, as shown in Eqs.…”

Section: Design and Simulationmentioning

confidence: 99%

“…In 2013, Cheng et al [17] proposed an tunable cross polarization converter based on L-shaped graphene nanostructures, which offered a further step in developing for dynamic reconfigurable devices. Similarly, a cross-polarization converter with the bandwidth of 25.8% is designed by Luo et al [18] and such a bandwidth can be regulated by controlling the E f of graphene sheets. With the development of graphene devices, it will have broader potential applications in various fields such as antennas [19], [20], filters [21], [22] and phase shifters [23].…”

Section: Introductionmentioning

confidence: 99%

Tunable Linear-to-Circular Polarization Converter Using the Graphene Transmissive Metasurface

et al. 2019

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In this article, a tunable linear-to-circular polarization converter (LTCPC) in terahertz (THz) regime using the graphene transmissive metasurface is proposed, which is composed of two resonant layers containing the metal and graphene resonators separated by a dielectric spacer. The linearly-polarized wave with normal incidence can be transformed to the circularly-polarized wave. The operating band can be dynamically regulated in THz band by electrically controlling the Fermi energy (E f) of the graphene sheets rather than reforming the structures. The optimized result of axial ratio (AR) band which is less than 3 dB is located at 2.64-3.29 THz (the relative bandwidth is 21.92%) in the case of E f = 0.1 eV. The physical characteristics of graphene are explored and the relevant operational results of the presented LTCPC are elucidated in this article. Compared with the conventional LTCPC, our design provides a more effective implementation method for wide applications, and it offers a further step in graphene controllable devices.

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“…Graphene, a two-dimensional carbon material, has been widely employed to configure polarization conversion metamaterials [23]- [30] due to its excellent ability of dynamically controlling the Fermi energy. Bulk Dirac semimetal (BDS), the material performs like the "three-dimensional (3D) graphene", has been introduced in metamaterial design [31]- [34].…”

Section: Introductionmentioning

confidence: 99%

Dual-Polarization, Tunable Breaking Window in the Polarization Conversion Pass Band in a Terahertz Dirac Semimetal-Based Metamaterial

et al. 2019

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We propose a planar THz hybrid bulk Dirac semimetal (BDS)-metal metamaterial which consists of a hybrid BDS-metal array on a dielectric layer and a back metallic mirror. The simulation results show that a spectral window that possesses high reflectance with no polarization conversion effect arises in the polarization conversion pass band due to the existence of the BDS rods. Interestingly, though the proposed structure possesses no symmetry property, the effects are nearly the same for x-and y-polarization incidences. We analyze the electric field distributions at the breaking frequency and attribute the phenomena to plasmonic analogue of electromagnetically induced reflectance (EIR-like) effect for x-polarization incidence and direct back scattering for y-polarization incidence. The dependence of the breaking window on the BDS rod length shows that, for both x-and y-polarization incidences, the breaking characteristic is mainly determined by the dipole resonance on the BDS rod. Moreover, the breaking window can be independently and dynamically manipulated by changing the Fermi energy of the BDS rods. Our results may provide potential applications in designing new polarization control devices.

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Broadband tunable terahertz polarization converter based on graphene metamaterial

Cited by 49 publications

References 42 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

Tunable Linear-to-Circular Polarization Converter Using the Graphene Transmissive Metasurface

Dual-Polarization, Tunable Breaking Window in the Polarization Conversion Pass Band in a Terahertz Dirac Semimetal-Based Metamaterial

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