Electrically tunable liquid crystal terahertz device based on double-layer plasmonic metamaterial

Yang, Jun; Wang, Peng; Shen, Tian; Gao, Sheng; Lu, Hongbo; Yin, Zhiping; Lai, Weien; Deng, Guangsheng

doi:10.1364/oe.27.027039

Cited by 38 publications

(22 citation statements)

References 29 publications

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“…A Drude model is adopted for the description of the optical properties of Al in the THz regime, which is defined as, ε Al = ε ∞ − ω 2 p /(ω 2 + iωγ ), where the plasma frequency ω p = 2.24 × 10 16 rad/s and the damping constant γ = 1.22 × 10 14 rad/s [32]. The complex reflective indexes of quartz is taken asñ = 1.94 + 0.002i [33]. The electric field of the incident plane wave is polarized in the x direction.…”

Section: Structure Design and Simulation Methodsmentioning

confidence: 99%

Sensing Enhancement of Electromagnetically Induced Transparency Effect in Terahertz Metamaterial by Substrate Etching

et al. 2021

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A broad range of terahertz (THz) metamaterials have been developed for refractive index sensing. However, most of these metamaterials barely make sufficient use of the excited electric field which is crucial to achieve high sensitivity. Here, we proposed a metamaterial sensor possessing electromagnetically induced transparency (EIT) resonance that is formed by the interference of dipole and quadrupole resonance. In particular, the strengthening of light-matter interaction is realized through substrate etching, leading to a remarkable improvement in sensitivity. Hence, three kinds of etching mode were presented to maximize the utilization of the electric field, and the corresponding highest sensitivity is enhanced by up to ~2.2-fold, from 0.260 to 0.826 THz/RIU. The proposed idea to etch substrate with a strong light-matter interaction can be extended to other metamaterial sensors and possesses potential applications in integrating metamaterial and microfluid for biosensing.

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Section: Structure Design and Simulation Methodsmentioning

confidence: 99%

Sensing Enhancement of Electromagnetically Induced Transparency Effect in Terahertz Metamaterial by Substrate Etching

et al. 2021

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“…As mentioned in Section 3, LC reorientations would result in a dramatic change in the refractive index of LC, which in turn, would further change the response to electromagnetic waves. In nematic LCs, the crystal is in a rod-shape and the external stimulations such as thermal heating, pressure, and the magnetic and electric field, can control its directional order, resulting in good refractive index tunability [42,59,[74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91]. Therefore, LCs are extensive used as the liquid background of solid metamaterials [51,52,92].…”

Section: Recent Development and Applications 41 Tunable Metamaterials With Liquid Crystalsmentioning

confidence: 99%

“…Compared with the thermal and UV irradiation-induced tunability of optical metamaterials, which have been experimentally tested, showing a slow temporal response, electrical tuning has a faster time response, which is the most attractive due to its easy integration and high reliability. Recently, a nematic liquid crystal-based tunable terahertz metamaterial which has large modulation depth and low insertion loss was designed [82]. The structure of the proposed compositive metamaterial is shown in Figure 5A, which consists of a two-layer sub-wavelength circular air loop array fabricated on a quartz glass substrate and embedded into the liquid crystal.…”

Section: Recent Development and Applications 41 Tunable Metamaterials With Liquid Crystalsmentioning

confidence: 99%

A Review of Tunable Electromagnetic Metamaterials With Anisotropic Liquid Crystals

Yang

Fan

et al. 2021

Front. Phys.

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The performance of metamaterial is limited to a designed narrow band due to its resonant nature, it is highly desirable to incorporate active inclusions in metamaterials to extend the operation bandwidth. This review summarizes the development in realizing the tunability of electromagnetic response in metamaterials incorporated with nematic liquid crystal (LC). From rigorous comparison, it is found that the anisotropic property of nematic LC is essential in predicting the influence of LC molecular director orientation on the resonant frequency of metamaterials. By carefully designing the metamaterials and properly infiltrating LC, the operation frequency of single/double negative parameters of metamaterials can be dynamically modulated with remarkable red/blue-shift, depending on the LC molecular orientation angle. Moreover, the recent liquid crystal-based developments and novel applications are investigated and highlighted.

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“…Therefore, achieving tunability of results has become a major research focus. [17][18][19][20] There are many types of active or tunable materials in nature that have been incorporated into metamaterials, such as ferroelectrics, 21 liquid crystals, 22,23 semiconductors, 24,25 two-dimensional materials, [26][27][28][29] and phase change materials. 30,31 Xiao et al proposed a graphene-based metasurface structure that exhibits a tunable EIT response under mid-infrared frequencies.…”

Section: Introductionmentioning

confidence: 99%

Dual-Tunable Polarization Insensitive Electromagnetically Induced Transparency in Metamaterials

Ning

Xiao

Chen

et al. 2021

Journal of Elec Materi

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A multilayer structure of a square ring of graphene with nesting vanadium dioxide (VO2) was investigated in this study. This structure exhibits electromagnetically induced transparency (EIT), which stems from a bright mode coupling with a dark mode. The permittivity values of graphene and VO2 can be modulated via chemical potential and temperature, respectively. The EIT effect can be tuned based on the chemical potential of graphene and temperature of VO2, resulting in a dual-tunable EIT effect. Simulation results confirmed that this dual-tunable EIT phenomenon is insensitive to polarization. These results may have potential applications in terahertz devices, such as slow light devices, switching devices, and sensors.

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Electrically tunable liquid crystal terahertz device based on double-layer plasmonic metamaterial

Cited by 38 publications

References 29 publications

Sensing Enhancement of Electromagnetically Induced Transparency Effect in Terahertz Metamaterial by Substrate Etching

Sensing Enhancement of Electromagnetically Induced Transparency Effect in Terahertz Metamaterial by Substrate Etching

A Review of Tunable Electromagnetic Metamaterials With Anisotropic Liquid Crystals

Dual-Tunable Polarization Insensitive Electromagnetically Induced Transparency in Metamaterials

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