Dynamically tunable Fano resonance with high Q factor based on asymmetric Dirac semimetal split-ring structure

High-Q metasurfaces have attracted much interest owing to their potential application in biological sensors. FANO is a type of high-Q factor metasurface. However, it is difficult to achieve large resonant intensity and a high-Q factor at the same time. In this paper, by sharpening the tips of the asymmetrical split-ring FANO structure and letting more charges stack at the tips to enhance tip coupling, the Q factor was significantly improved without sacrificing too much resonant intensity. Simulation results showed that the Q factor increased up to 2.4 times, while the resonant intensity stayed higher than 20 dB, and the experiment results agreed with the simulations. This indicated that the tip-field-enhancement theory can be applied in time-harmonic electromagnetic-fields, and the method proposed here can be used to increase the sensitivity and accuracy of microfluidic sensors. Additionally, other types of research, such as on antenna design, could benefit from this theory.

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A Novel Symmetrical Split Ring Resonator Based on Microstrip for Microwave Sensors

Measurement Science Review ◽

10.1515/msr-2016-0004 ◽

2016 ◽

Vol 16 (1) ◽

pp. 21-27 ◽

Cited By ~ 8

Author(s):

Rammah A. Alahnomi ◽

Z. Zakaria ◽

E. Ruslan ◽

Amyrul Azuan Mohd Bahar

Keyword(s):

Insertion Loss ◽

Ring Resonator ◽

Performance Enhancement ◽

Split Ring Resonator ◽

Q Factor ◽

Loose Coupling ◽

Split Ring ◽

Linear Coupling ◽

High Q ◽

Microwave Sensors

Abstract In this paper, novel symmetrical split ring resonator (SSRR) is proposed as a suitable component for performance enhancement of microwave sensors. SSRR has been employed for enhancing the insertion loss of the microwave sensors. Using the same device area, we can achieve a high Q-factor of 141.54 from the periphery enhancement using Quasi-linear coupling SSRR, whereas loose coupling SSRR can achieve a Q-factor of 33.98 only. Using Quasi-linear coupling SSRR, the Q-factor is enhanced 4.16 times the loose coupling SSRR using the same device area. After the optimization was made, the SSRR sensor with loose coupling scheme has achieved a very high Qfactor value around 407.34 while quasi-linear scheme has achieved high Q-factor value of 278.78 at the same operating frequency with smaller insertion loss. Spurious passbands at 1st, 2nd, 3rd, and 4th harmonics have been completely suppressed well above -20 dB rejection level without visible changes in the passband filter characteristics. The most significant of using SSRR is to be used for various industrial applications such as food industry, quality control, bio-sensing medicine and pharmacy. The simulation result that Quasi-linear coupling SSRR is a viable candidate for the performance enhancement of microwave sensors has been verified.

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High Q-Factor Hybrid Metamaterial Waveguide Multi-Fano Resonance Sensor in the Visible Wavelength Range

Nanomaterials ◽

10.3390/nano11061583 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1583

Author(s):

Hongyan Yang ◽

Yupeng Chen ◽

Mengyin Liu ◽

Gongli Xiao ◽

Yunhan Luo ◽

...

Keyword(s):

Quality Factor ◽

Wavelength Range ◽

Fano Resonance ◽

Q Factor ◽

High Q ◽

Visible Wavelength ◽

Metamaterial Waveguide ◽

Visible Wavelength Range ◽

Resonance Sensor ◽

Hybrid Metamaterial

We propose a high quality-factor (Q-factor) multi-Fano resonance hybrid metamaterial waveguide (HMW) sensor. By ingeniously designing a metal/dielectric hybrid waveguide structure, we can effectively tailor multi-Fano resonance peaks’ reflectance spectrum appearing in the visible wavelength range. In order to balance the high Q-factor and the best Fano resonance modulation depth, numerical calculation results demonstrated that the ultra-narrow linewidth resolution, the single-side quality factor, and Figure of Merit (FOM) can reach 1.7 nm, 690, and 236, respectively. Compared with the reported high Q-value (483) in the near-infrared band, an increase of 30% is achieved. Our proposed design may extend the application of Fano resonance in HMW from mid-infrared, terahertz band to visible band and have important research value in the fields of multi-wavelength non-labeled biosensing and slow light devices.

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Breaking the symmetry to manipulate the magnetic Fano resonance in double split ring/square ring structure

Materials Research Express ◽

10.1088/2053-1591/aad15c ◽

2018 ◽

Vol 5 (8) ◽

pp. 085004 ◽

Cited By ~ 1

Author(s):

Ying Zhang ◽

Yiping Huo ◽

Nini Cai ◽

Yuhai Li ◽

Chen Zhou ◽

...

Keyword(s):

Fano Resonance ◽

Ring Structure ◽

Split Ring ◽

Magnetic Fano Resonance

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Tunable Ultra‐High Q‐Factor and Figure of Merit based on Fano Resonance in Graphene–Dielectric Multilayer Corrugated Structure

Advanced Optical Materials ◽

10.1002/adom.202001443 ◽

2020 ◽

Vol 8 (24) ◽

pp. 2001443

Author(s):

Xiangqian Jiang ◽

Weiwei Liu ◽

Bing Zhang ◽

Xiudong Sun

Keyword(s):

Fano Resonance ◽

Figure Of Merit ◽

Q Factor ◽

High Q ◽

Corrugated Structure ◽

Dielectric Multilayer

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Active Switching of Extremely High-Q Fano Resonances Using Vanadium Oxide-Implanted Terahertz Metamaterials

Applied Sciences ◽

10.3390/app10010330 ◽

2020 ◽

Vol 10 (1) ◽

pp. 330

Author(s):

Jing Ma ◽

Zhi-Hang Wang ◽

Huan Liu ◽

Ya-Xian Fan ◽

Zhi-Yong Tao

Keyword(s):

Vanadium Oxide ◽

Fano Resonance ◽

Surface Current ◽

Switching Behavior ◽

Temperature Sensitive ◽

Q Factor ◽

Fano Resonances ◽

Thermally Induced ◽

High Q ◽

Order Of Magnitude

In this paper, we demonstrate an active switching of extremely high Q-factor Fano resonances using vanadium oxide (VO2)-implanted THz asymmetric double C-shaped metamaterial (MM) structures. The simulation results indicate the highly temperature-sensitive nature of the double Fano resonances that can be switched at very low external thermal pumping (68 °C), which is only slightly higher than room temperature. We employ the surface current and electric field distributions of the structure to analyze the physical mechanism of the observed switching behavior in the thermally excited Fano MMs. More importantly, by optimizing the asymmetric parameter (offset length), the linewidth of the Fano resonance can reach only 0.015 THz and the Q-factor is as high as 98, which is one order of magnitude higher than that of the traditional MMs. The findings of this work would enable a thermally-induced high-Q Fano resonance MMs for ultra-sensitive sensors, modulators, low threshold switching in metadevices.

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