Frequency-switchable VO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e353" altimg="si10.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>-based coding metasurfaces at the terahertz band

Li, Jiahui; Zhang, Yating; Li, Jining; Li, Jie; Yue, Yang; Huang, Jin; Ma, Chaoxuan; Ma, Zhenzhen; Zhang, Zhang; Liu, Liang; Yao, Jianquan

doi:10.1016/j.optcom.2019.124744

Cited by 37 publications

(7 citation statements)

References 44 publications

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“…For instance, refractive indices of phase-change materials can be tunable. Furthermore, VO 2 has been studied in the THz region [ 24 , 25 , 26 ]. As the BE structure requires constant transmission, it is necessary to employ a material to ensure sufficient transmittance and to avoid rapid changes in the refractive index and in transmission (conductivity) by strict control measures [ 27 ].…”

Section: Discussion and Future Planmentioning

confidence: 99%

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Sugaya

Kawano

2021

Sensors

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Terahertz waves are located in the frequency band between radio waves and light, and they are being considered for various applications as a light source. Generally, the use of light requires focusing; however, when a terahertz wave is irradiated onto a small detector or a small measurement sample, its wavelength, which is much longer than that of visible light, causes problems. The diffraction limit may make it impossible to focus the terahertz light down to the desired range by using common lenses. The Bull’s Eye structure, which is a plasmonic structure, is a promising tool for focusing the terahertz light beyond the diffraction limit and into the sub-wavelength region. By utilizing the surface plasmon propagation, the electric field intensity and transmission coefficient can be enhanced. In this study, we improved the electric field intensity and light focusing in a small region by adapting the solid immersion method (SIM) from our previous study, which had a frequency-tunable nonconcentric Bull’s Eye structure. Through electromagnetic field analysis, the electric field intensity was confirmed to be approximately 20 times higher than that of the case without the SIM, and the transmission measurements confirmed that the transmission through an aperture had a gap of 1/20 that of the wavelength. This fabricated device can be used in imaging and sensing applications because of the close contact between the transmission aperture and the measurement sample.

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Section: Discussion and Future Planmentioning

confidence: 99%

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Sugaya

Kawano

2021

Sensors

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“…It appears therefore crucial to implement faster switching schemes, also with a view toward applications to higher frequencies (e.g., terahertz). Within this framework, emerging platforms based on graphene [55][56][57] and vanadium dioxide [58,59] seem very promising [60].…”

Section: Discussionmentioning

confidence: 99%

Recent advances and perspectives on space-time coding digital metasurfaces

et al. 2020

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Within the overarching framework of space-time metastructures, digital metasurfaces based on spatio-temporal coding are emerging as powerful and versatile architectures for complex field manipulations, also in view of their inherently programmable nature. Here, we provide a compact survey of our recent results and ongoing studies in this research area. Examples of field manipulations include harmonic beam steering and/or shaping and programmable nonreciprocal effects. Possible applications are abundant and range from wireless communications to radars and imaging.

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“…41,42 As a phase change material, the phase transition temperature of VO 2 is approximately 340 K. It can be considered to exhibit an insulating state prior to phase transition. Within the THz range, the relative permittivity of VO 2 can be expressed by the Drude model 31 as where ε ∞ = 12. Experimental results have demonstrated that the conductivity vo 2 of VO 2 varies from 10 to 2 × 10 5 S/m, 43 where γ = 5.75 × 10 13 s −1 and p ( vo 2 ) = p ( 0 )( vo 2 ∕ 0 ) 0.5 .…”

Section: Design and Theorymentioning

confidence: 99%

“…[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. This result demonstrated that EIT responses can be dynamically shifted in the frequency domain by adjusting the Fermi level of graphene.…”

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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Frequency-switchable VO2-based coding metasurfaces at the terahertz band

Cited by 37 publications

References 44 publications

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing

Recent advances and perspectives on space-time coding digital metasurfaces

Dual-Tunable Polarization Insensitive Electromagnetically Induced Transparency in Metamaterials

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