High Q-factor toroidal resonances driven by bound states in the continuum in all-dielectric metamaterial at terahertz frequencies

Ma, Tian; Li, Jun; Luo, Zhenmin

doi:10.1016/j.optlastec.2022.108745

Cited by 14 publications

(2 citation statements)

References 42 publications

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“…From the previous researches, a variety number of metamaterials is proposed. However, due to limitations in manufacturing processes, some of them have remained in the simulation phase [29][30][31][32][33]. The dielectric materials were used to design the metamaterials, and the Q-factor is relatively high due to the low loss of the dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

A study on the electromagnetic mechanism of a flexible terahertz toroidal dipole metasurfaces

Wang,

Huang,

et al. 2024

Mater. Res. Express

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We have designed and fabricated metasurfaces structures generated toroidal dipole phenomenon by fabricating periodic metal pattern on polyimide substrate. The metasurfaces structure consists of two symmetric split rings along the Y-axis.The impact of structural parameters, gap, and SR, on the electromagnetic characteristics of metasurfaces at terahertz frequencies was investigated. An increase in gap results in a blue shift phenomenon in the amplitude transmission spectrum, while an increase in SR leads to a red shift phenomenon in the amplitude transmission spectrum.The intrinsic mechanism of the toroidal resonance is investigated more deeply by calculating the multipole scattering power and Q-factor. Q-factor values of 2.3 and 9.5 were obtained at low and high frequencies, respectively. Terahertz toroidal dipole metasurfaces made on flexible substrates like this have the potential for applications in terahertz functional devices, such as sensors and tuners.

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Section: Introductionmentioning

confidence: 99%

A study on the electromagnetic mechanism of a flexible terahertz toroidal dipole metasurfaces

Wang,

Huang,

et al. 2024

Mater. Res. Express

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“…These advantages prompt it to be extensively adapted for visible light [ 6 , 7 , 8 ], infrared (IR) light [ 9 , 10 , 11 , 12 , 13 , 14 ], terahertz (THz) frequency [ 15 , 16 , 17 , 18 ], etc. Therefore, metamaterials have been reported in many types of research and investigations in couplers [ 19 ], antennas [ 20 , 21 , 22 ], metalens [ 23 , 24 ], programmable logic devices [ 25 , 26 , 27 ], and sensors [ 28 , 29 , 30 ] fields. In addition, THz wave is known as far IR ray, which possesses the preponderances of high penetrability, low photon energy, and great coherence [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Tunable MEMS-Based Terahertz Metamaterial for Pressure Sensing Application

Lai

et al. 2023

Micromachines

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In this study, a tunable terahertz (THz) metamaterial using the micro-electro-mechanical system (MEMS) technique is proposed to demonstrate pressure sensing application. This MEMS-based tunable metamaterial (MTM) structure is composed of gold (Au) split-ring resonators (SRRs) on patterned silicon (Si) substrate with through Si via (TSV). SRR is designed as a cantilever on the TSV structure. When the airflow passes through the TSV from bottom to up and then bends the SRR cantilever, the SRR cantilever will bend upward. The electromagnetic responses of MTM show the tunability and polarization-dependent characteristics by bending the SRR cantilever. The resonances can both be blue-shifted from 0.721 THz to 0.796 THz with a tuning range of 0.075 THz in transverse magnetic (TM) mode and from 0.805 THz to 0.945 THz with a tuning range of 0.140 THz in transverse electric (TE) mode by changing the angle of SRR cantilever from 10° to 45°. These results provide the potential applications and possibilities of MTM design for use in pressure and flow rate sensors.

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Terahertz Meta-waveguide Based upon Strongly Near-Field Coupled Split-Ring Resonators

Islam,

Bhardwaj,

Bhowmik

et al. 2023

J Infrared Milli Terahz Waves

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High Q-factor toroidal resonances driven by bound states in the continuum in all-dielectric metamaterial at terahertz frequencies

Cited by 14 publications

References 42 publications

A study on the electromagnetic mechanism of a flexible terahertz toroidal dipole metasurfaces

A study on the electromagnetic mechanism of a flexible terahertz toroidal dipole metasurfaces

Tunable MEMS-Based Terahertz Metamaterial for Pressure Sensing Application

Terahertz Meta-waveguide Based upon Strongly Near-Field Coupled Split-Ring Resonators

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