Investigation of tunable Fano resonances based on the InSb metamaterials

Modern Physics Letters B ◽

10.1142/s0217984921502444 ◽

2021 ◽

pp. 2150244

Author(s):

Chenyuyi Shi ◽

Jun Peng ◽

An Jin ◽

Jin Leng ◽

Xiaoyong He ◽

...

Keyword(s):

Amplitude Modulation ◽

Fano Resonance ◽

Fano Resonances ◽

Terahertz Devices ◽

Propagation Properties ◽

Peak Value

Based on the hybrid semiconductive InSb metamaterials (MMs), we investigated the tunable Fano resonances in the terahertz regime, including the effects of carrier concentrations of InSb layer, environment temperatures and operation frequencies. The results manifested that an obvious Fano resonance was observed by using the heterostructure of InSb bars, the peak value of Fano resonance reached more than 0.97 with a high [Formula: see text]-factor of larger than 50. By changing the carrier concentrations of InSb layer, the propagation properties of semiconductor MM structures can be effectively modulated, the amplitude modulation of Fano resonance can reach more than 80%. The results are helpful for designing novel tunable terahertz devices with high [Formula: see text]-factor, e.g. modulators, sensors and antenna.

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Dual-Fano resonances and sensing properties in the crossed ring-shaped metasurface

10.21203/rs.2.24487/v1 ◽

2020 ◽

Author(s):

Zhihui He ◽

Chunjiang Li ◽

Wei Cui ◽

Weiwei Xue ◽

Zhenxiong Li ◽

...

Keyword(s):

Fano Resonance ◽

Incident Light ◽

Ring Structure ◽

Circular Ring ◽

Resonance Peak ◽

Fdtd Simulation ◽

Fano Resonances ◽

Surface Plasmon Resonances ◽

Sensing Properties ◽

Plasmonic Sensors

Abstract We study dual-Fano resonances and its sensing properties in a crossed ring-shaped metasurface by use of the finite-different time-domain (FDTD) simulation. The results show that the dual-Fano resonances in the proposed crossed ring-shaped metasurface are caused by the interaction among three local surface plasmon resonances (LSPRs), and the spectra of dual-Fano resonances can be tuned by the radius of the circular ring (CR) nanostructure, the distance between the center of the two CRs in x direction, and the polarization of the incident light. Interestingly, single Fano resonance splits into dual-Fano resonances in the case of asymmetric ring structure arrangement or non-y-axis polarized incident or the distance d<120 nm. Moreover, we can also find that the refractive sensitivity in the proposed crossed ring-shaped metasurface can reach up to 1010 nm/RIU and 1300 nm/RIU at Fano resonance peak 1 and Fano resonance peak 2, respectively. These results may play an important role for designing high sensitive plasmonic sensors.

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Multiple Fano resonances Based on the Rectangular cavity resonator and crescent-shaped cavity resonator

10.21203/rs.3.rs-84286/v1 ◽

2020 ◽

Author(s):

Jun Zhu ◽

Ge Wang

Keyword(s):

Water Content ◽

Heavy Oil ◽

Fano Resonance ◽

Rotation Angle ◽

Volume Fraction ◽

Cavity Resonator ◽

Rectangular Cavity ◽

Fano Resonances ◽

Unconventional Oil ◽

Metal Insulator Metal

Abstract World is rich in unconventional oil and various alternatives to petroleum. However, conventional oil production declines so quickly that it is likely these unconventional oil resources cannot be put into production fast enough, and thus will not be compensated sufficiently. We realize detecting rapid detection of water content in heavy oil. The waveguide consists of a metal-insulator-metal (MIM) waveguide, rectangular cavity resonator, and crescent-shaped cavity resonator. The effects of the coupling distance, geometry of the crescent-shaped cavity resonator and its rotation angle, and length and width of the rectangular cavity resonator on the Fano resonance lines were numerically analyzed. Multiple Fano resonances can be produced as the rotation angle of the crescent-shaped cavity resonator is adjusted, and the sensor’s refractive index sensitivity was found to be \(935.71 \text{n}\text{m}/\text{R}\text{I}\text{U}\). By measuring the water content in heavy oil, we found that the Fano resonance lines shift toward shorter wavelengths as the volume fraction of water content increases. The detection resolution in heavy oil \(1.79\times {10}^{-9}\). The results presented here show that water content in heavy oil can be calculated using the measured change in the Fano resonance wavelength.

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A Plasmonic Structure of Fano Resonance in the MIM Waveguide with r-Shaped Resonator for Refractive Index Sensor

10.21203/rs.3.rs-1148319/v1 ◽

2022 ◽

Author(s):

Siti Rohimah ◽

He Tian ◽

Jinfang Wang ◽

Jianfeng Chen ◽

Jina Li ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Refractive Index ◽

Fano Resonance ◽

Geometrical Parameters ◽

Fano Resonances ◽

The Finite Element Method ◽

Plasmonic Structure ◽

Mim Waveguide ◽

Element Method

Abstract A plasmonic structure of metal-insulator-metal (MIM) waveguide consisting of a single baffle waveguide and an r-shaped resonator is designed to produce Fano resonance. The finite element method uses the finite element method to analyze the transmission characteristics and magnetic field distributions of the plasmonic waveguide distributions. The simulation results exhibit two Fano resonances that can be achieved by the interference between a continuum state in the baffle waveguide and a discrete state in the r-shaped resonator. The Fano resonances can be simply tuned by changing geometrical parameters of the plasmonic structure. The value variations of geometrical parameters have different effects on sensitivity. Thus, the sensitivity of the plasmonic structure can achieve 1333 nm/RIU, with a figure of merit of 5876. The results of the designed plasmonic structure offer high sensitivity and nano-scale integration, which are beneficial to refractive index sensors, photonic devices at the chip nano-sensors, and biosensors applications.

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Fano resonances in the corrugated disk resonator and their applications

Terahertz Science and Technology ◽

10.1051/tst/2020134119 ◽

2020 ◽

Vol 13 (4) ◽

pp. 119-134

Author(s):

Lin Chen ◽

Bo Liu ◽

Yiming Zhu

Keyword(s):

Fano Resonance ◽

Hybrid Structure ◽

Plasmonic Waveguide ◽

Metal Particles ◽

Fano Resonances ◽

Disk Resonator ◽

Resonance Modes ◽

Shed Light ◽

The Way

We have experimentally excited terahertz multipolar Fano resonances in two asymmetrical metal particles: a defective corrugated metallic disk(CMD) structure and a hybrid structure consisted of a C-shaped resonator and a CMD. Furthermore, the Fano resonance modes can also be excited by the interaction between plasmonic waveguide and CMD. Our findings have shed light into the terahertz multipolar Fano resonances in asymmetrical CMD and opened the way to the design of terahertz plasmonic devices.

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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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Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO2 Hybrid Metasurface

Nanomaterials ◽

10.3390/nano10040687 ◽

2020 ◽

Vol 10 (4) ◽

pp. 687 ◽

Cited By ~ 17

Author(s):

Zhihui He ◽

Weiwei Xue ◽

Wei Cui ◽

Chunjiang Li ◽

Zhenxiong Li ◽

...

Keyword(s):

Surface Plasmon ◽

Fano Resonance ◽

Fdtd Simulation ◽

Fano Resonances ◽

Local Surface ◽

Surface Plasmon Resonances ◽

Coupled Mode ◽

Plasmon Resonances ◽

Refractive Index Sensors ◽

Plasmon Polaritons

We investigate Fano resonances and sensing enhancements in a simple Au/TiO2 hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO2 structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO2 hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO2 hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO2 metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors.

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Fano resonances in nanorod dimers antenna

Modern Physics Letters B ◽

10.1142/s0217984917502025 ◽

2017 ◽

Vol 31 (18) ◽

pp. 1750202 ◽

Cited By ~ 6

Author(s):

Junqiao Wang ◽

Jia Zhang ◽

Yongzhi Tian ◽

Kaijun Mu ◽

Chunzhen Fan ◽

...

Keyword(s):

Fano Resonance ◽

Near Infrared ◽

Fano Resonances ◽

Resonance Detuning ◽

Induced Currents ◽

Nanorod Dimer

Without losing symmetry, plasmonic Fano resonances have been observed and investigated in multiple nanorod dimers antennae in this paper. The dipole–dipole Fano resonance in three nanorod dimers can be excited simultaneously due to the resonance detuning, and the induced currents of nanorod dimers on both sides are in-phase and out-of-phase with the middle nanorod dimer, respectively. The sharp Fano dip excited in three nanorod dimers antennae can be used to realize the high sensitive sensing of 1116 nm/RIU in the visible and near infrared regions. Furthermore, the Fano resonance is also observed in plasmonic nanoantennae with four nanorod dimers.

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Fano Resonances: Tunable Fano Resonance and Plasmon-Exciton Coupling in Single Au Nanotriangles on Monolayer WS2 at Room Temperature (Adv. Mater. 22/2018)

Advanced Materials ◽

10.1002/adma.201870155 ◽

2018 ◽

Vol 30 (22) ◽

pp. 1870155

Author(s):

Mingsong Wang ◽

Alex Krasnok ◽

Tianyi Zhang ◽

Leonardo Scarabelli ◽

He Liu ◽

...

Keyword(s):

Fano Resonance ◽

Room Temperature ◽

Fano Resonances ◽

Exciton Coupling

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Tunable Fano Resonance and Enhanced Sensing in Terahertz Metamaterial

Frontiers in Physics ◽

10.3389/fphy.2020.605125 ◽

2021 ◽

Vol 8 ◽

Author(s):

Yun Wang ◽

Shengyao Jia ◽

Jianyuan Qin

Keyword(s):

Performance Optimization ◽

Fano Resonance ◽

Figure Of Merit ◽

Ring Resonators ◽

Fano Resonances ◽

Low Loss ◽

Split Ring ◽

Refractive Index Sensing ◽

Sensing Applications ◽

Modulation Filtering

Fano resonances in metamaterial are important due to their low-loss subradiant behavior that allows excitation of high quality (Q) factor resonances extending from the microwave to the optical bands. Fano resonances have recently showed their great potential in the areas of modulation, filtering, and sensing for their extremely narrow linewidths. However, the Fano resonances in a metamaterial system arise from the interaction of all that form the structure, limiting the tunability of the resonances. Besides, sensing trace analytes using Fano resonances are still challenging. In the present work, we demonstrate the excitation of Fano resonances in metamaterial consisting of a period array of two concentric double-split-ring resonators with symmetry breaking (position asymmetry and gaps asymmetry). The tunability and sensing of Fano resonances are both studied in detail. Introducing position asymmetry in the metamaterial leads to one Fano resonance located at 0.50 THz, while introducing gaps asymmetry results in two Fano resonances located at 0.35 THz and 0.50 THz. The transmittance, position, and linewidth of the three Fano resonances can be easily tuned by varying the asymmetry deviations. The Q factor and figure of merit (FoM) of Fano resonances with different asymmetry deviations are calculated for performance optimization. The Fano resonances having the highest FoM are used for the sensing of analytes at different refractive indices, and the Fano resonance performing the best in refractive index sensing is further applied to detect the analyte thickness. The results demonstrate that the tunable Fano resonances show tremendous potential in sensing applications, offering an approach to engineering highly efficient modulators and sensors.

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