Fano resonance and sensing application based on terahertz asymmetric split-ring metasurfaces

Wang, Xinyue; Liang, Ting; Li, Guibin; Shen, Jingling; Zhang, Bo

doi:10.1016/j.jallcom.2023.173130

Cited by 4 publications

(1 citation statement)

References 40 publications

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“…Furthermore, the metallic structures offer an additional advantage over all-dielectric counterparts by potentially reducing etching errors, which are very common in fabricating all-dielectric structures. Several works have reported high Q resonance mode excitation using a metallic metamaterial system at terahertz frequencies [9][10][11]. Jansen et al studied the excitation of trapped mode resonances in metallic THz metasurfaces [12].…”

Section: Introductionmentioning

confidence: 99%

High-quality factor Quasi-BIC mode via selective symmetry-breaking approach in a terahertz metasurface

Kumar Bhowmik,

Rohith,

John

et al. 2024

New J. Phys.

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This study numerically and experimentally presents a novel approach to excite bound state in the continuum (BIC) mode with a high Q-factor in the THz meta-molecule (composition of meta-atoms) system, leveraging a unique method of selective symmetry breaking in a ring-shaped metamolecule system. Unlike conventional strategies that uniformly disrupt the symmetry across all resonators to excite a quasi-BIC mode, this innovative technique targets only half of the unit cell for symmetry perturbation. This selective symmetry breaking minimizes radiative losses and enhances the Q-factor of the quasi-bound states in continuum (quasi-BIC) modes. The selective symmetry breaking is achieved in a ring-shaped metamolecule system by simple radial perturbation. The results depict a notable improvement in the Q-factor, achieving values as high as 107 in simulation, a significant enhancement compared to the uniformly symmetry-breaking approach, which exhibits Q-factors around 25.80. The experimental transmission spectrum and the near-field scanning images firmly validate the existence of the high Q BIC mode under this strategic symmetry-breaking approach. This work may open new avenues for developing advanced THz devices with promising applications in sensing, filtering, and non-linearity in the THz domain.

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Section: Introductionmentioning

confidence: 99%

High-quality factor Quasi-BIC mode via selective symmetry-breaking approach in a terahertz metasurface

Kumar Bhowmik,

Rohith,

John

et al. 2024

New J. Phys.

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Research on Drug Efficacy using a Terahertz Metasurface Microfluidic Biosensor Based on Fano Resonance Effect

Zhao,

Hou,

Yan

et al. 2024

ACS Appl. Mater. Interfaces

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Advanced biosensors must exhibit high sensitivity, reliability, and convenience, making them suitable for detecting trace samples in biological or medical applications. Currently, biometric identification is the predominant method in clinical practice, but it is complex and time-consuming. In this study, we propose an optical metasurface utilizing the Fano resonance effect, which exhibits a sharp resonance with a transmittance of 32% at 0.65 THz. The resonance dip has a narrow bandwidth of 0.07 THz and a high Q-factor of 42. This resonance arises from the coupling of bright and dark modes, underpinned by the electromagnetic mechanism of Fano resonance. We integrated the metasurface into a microfluidic platform and fabricated low-temperature gallium arsenide photoconductive antennas (LT-GaAs-PCAs) on both sides of the microfluidics to efficiently generate and detect THz waves, significantly reducing the system's volume. The biosensor's detection limits for Escherichia coli (E. coli) and cefamandole nafate are 5 × 10 3 cells/mL and 5 μg/mL, respectively. Experimentally, when E. coli and cefamandole nafate solutions were sequentially injected into the microfluidic chip, a blue shift in the spectrum was observed. The sensor measured a 95.2% killing rate of E. coli by 40 μg/mL cefamandole nafate solution, with only a 3% deviation from biological experiments. Additionally, a timed killing experiment using 40 μg/mL cefamandole nafate on E. coli revealed a 93.7% killing rate within 3 min. This research presents a THz microfluidic biosensor with rapid detection, high sensitivity, and enhanced portability and integration, offering a promising approach for biomedical research, including antibiotic efficacy assessment and bacterial concentration monitoring.

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Conductively coupled terahertz metamaterials with dual functions of electromagnetically induced transparent and Fano effects for sensing applications

Chen,

Sun,

Zhou

et al. 2024

Phys. Scr.

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A terahertz metamaterial structure consisting of two U-shaped split-ring resonators and a horizontal cut-line resonator is designed for realizing the electromagnetically induced transparency (EIT) effect and the Fano resonance effect. The genesis of the EIT and Fano resonance bifunctionality is illustrated by combining the near-field distribution analysis of transparent windows and transmission dips. Interestingly, the bifunctional dual-band transparency effect could transform into a single-functional single-band transparency effect when we change the position of the square metal sheet in the vertical direction of the composited terahertz metamaterial structure. In addition, based on the high-quality factor of Fano resonance response, the proposed bifunctional terahertz metamaterial device has good refractive index sensing sensitivity. These results indicate that our proposed terahertz metamaterial can provide guidance for the design of subsequent multifunctional and integrated metamaterials and optoelectronic devices.

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Fano resonance and sensing application based on terahertz asymmetric split-ring metasurfaces

Cited by 4 publications

References 40 publications

High-quality factor Quasi-BIC mode via selective symmetry-breaking approach in a terahertz metasurface

High-quality factor Quasi-BIC mode via selective symmetry-breaking approach in a terahertz metasurface

Research on Drug Efficacy using a Terahertz Metasurface Microfluidic Biosensor Based on Fano Resonance Effect

Conductively coupled terahertz metamaterials with dual functions of electromagnetically induced transparent and Fano effects for sensing applications

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