Comparison Between the Linear and Nonlinear Homogenization of Graphene and Silicon Metasurfaces

Ren, Qun; You, Jian Wei; Panoiu, Nicolae C.

doi:10.1109/access.2020.3026313

Cited by 4 publications

(3 citation statements)

References 73 publications

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“…As this is based on the intricate design of the metasurface, from the constituent materials, meta‐atoms geometry, and layout, to the integration of an optical pumping source, there remains plenty of potential for improvements in this area. For example, combining the nonlinear response of materials with other tuning mechanisms is one avenue that is being actively explored, such as in the nonlinear response of ENZ TCOs, such as AZO [ 249 ] and ITO, [ 250 ] the integration of graphene, [ 251–253 ] in kirigami‐based metasurfaces, [ 254 ] and through the nonlinear responses of PCMs. [ 255 ]…”

Section: Discussion and Outlookmentioning

confidence: 99%

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

Badloe

Lee

Seong

et al. 2021

Advanced Photonics Research

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In the field of nanophotonics, metasurfaces have come to the forefront in real‐world applications, owing to their accessible exotic optical properties that can be readily designed and fabricated using currently available techniques. The subwavelength dimensions and lightweight characteristics of metasurfaces are attractive qualities for the miniaturization of optical devices and are already exploited in devices that can rival, and sometimes even outperform, conventional bulky optics. Over the past decade, ample research has been undertaken to produce high‐performance metasurfaces with exciting optical properties that cannot be found in nature or achieved with conventional optics. To open the path to widely used devices in our everyday lives, the next obvious step for metasurfaces is the development of tunability. Herein, the techniques and development of applications of tunable metasurfaces are presented through the incorporation of active materials and controllable external stimuli, and the uncovered tunable characteristics are critically analyzed. The review rounds up by proposing the future directions and prospects for actively tunable metasurfaces and their potential practical applications.

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Section: Discussion and Outlookmentioning

confidence: 99%

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

Badloe

Lee

Seong

et al. 2021

Advanced Photonics Research

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“…The Fermi energy levels of graphene can be altered by using chemical doping or electrostatic gating [ 17 , 18 ], and the electrical conductivity of graphene is correspondingly changed, which makes it a promising candidate for the design of tunable devices. Therefore, graphene-based PCM is expected to achieve good tunability [ 19 , 20 , 21 ]. However, graphene PCM [ 22 , 23 , 24 ] has single polarization properties, which is still limited in functionality.…”

Section: Introductionmentioning

confidence: 99%

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

et al. 2021

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A hybrid dual-frequency polarized reconfigurable terahertz antenna is designed and studied. Graphene and TOPAS are employed as the polarization conversion metasurface and dielectric substrate, respectively, enabling tunable polarization conversion and circular polarization. TOPAS is a good substrate material for broadband THz components due to its low absorption. By adjusting the chemical potential of graphene between 0 eV and 0.5 eV, the polarization state in the band of 1 THz (0.76–1.02 THz) and 2.5 THz (2.43–2.6 THz) can be reconstructed. Thanks to the multilayer graphene structure and low absorption TOPAS, the graphene metasurface exhibits a broad bandwidth of 0.26 and 0.17 THz, respectively, in the band of 1 THz and 2.5 THz. The working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around 1 THz (0.7–0.75 THz, 0.96–1.04 THz) and 2.5 THz (2.42–2.52 THz), respectively, without changing the physical geometry. Moreover, the graphene antenna, metasurface, and hybrid structure are tested, respectively, to verify that the components do not interfere with each other in performance. The hybrid antenna shows great potential in tunable terahertz devices and related applications.

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“…For the application of terahertz technology in spectral sensing, security imaging, and wireless communication, terahertz functional devices with high-Q factor play an essential role Jansen et al (2011), Singh et al (2014. The high-Q factor is an essential performance index in nonlinear research based on solid field terahertz technology, which means better monochromaticity, maximum dispersion of slow light, and more vital terahertz matter interactionMittleman (2017), Ren et al (2020), Wang et al (2021). However, the reported Q-factor of terahertz devices based on EIT effect is normally lower than 10, which can not meet the needs of practical applications for high-Q factor Xu et al (2016).…”

mentioning

confidence: 99%

Polarization multiplexing multichannel high-Q terahertz sensing system

Wang

Ren²,

Cai³

et al. 2023

Front. Nanotechnol.

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Terahertz functional devices with high-Q factor play an important role in spectral sensing, security imaging, and wireless communication. The reported terahertz devices based on the electromagnetic induction transparency (EIT) effect cannot meet the needs of high-Q in practical applications due to the low-Q factor. Therefore, to increase the Q-factor of resonance, researchers introduced the concept of bound state in the continuum (BIC). In the quasi-BIC state, the metasurface can be excited by the incident wave and provide resonance with a high-Q factor because the condition that the resonant state of the BIC state is orthogonal is not satisfied. The split ring resonator (SRR) is one of the most representative artificial microstructures in the metasurface field, and it shows great potential in BIC. In this paper, based on the classical single-SRR array structure, we combine the large and small SRR and change the resonance mode of the inner and outer SRR by changing the outer radius of the inner SRR. The metasurface based on parameter-tuned BIC verified that the continuous modulation of parameters in a system could make a pair of resonant states strongly coupled, and the coherent cancellation of the resonant states will cause the linewidth of one of the resonant states to disappear, thus forming BIC. Compared with the single-SRR array metasurface based on symmetry-protected BIC, the dual-SRR array metasurface designed in this paper has multiple accidental BICs and realizes multichannel multiplexing of X-polarization and Y-polarization. It provides a brilliant platform for high-sensitivity optical sensor array, low threshold laser and efficient optical harmonic generation.

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Comparison Between the Linear and Nonlinear Homogenization of Graphene and Silicon Metasurfaces

Cited by 4 publications

References 73 publications

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

Polarization multiplexing multichannel high-Q terahertz sensing system

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