Fano resonances in nanorod dimers antenna

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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Broadband wavelength demultiplexer using Fano-resonant metasurface

Nanophotonics ◽

10.1515/nanoph-2019-0492 ◽

2020 ◽

Vol 9 (5) ◽

pp. 1015-1022

Author(s):

Sang-Eun Mun ◽

Chulsoo Choi ◽

Jongwoo Hong ◽

Byoungho Lee

Keyword(s):

Optical Sensors ◽

Fano Resonance ◽

Near Infrared ◽

Infrared Region ◽

Proof Of Concept ◽

Amplitude Control ◽

Complete Control ◽

Wide Range ◽

Simulation And Experiment ◽

Design Freedom

AbstractFano resonance, one of the interesting resonance phenomena in physics, provides versatile applications when combined with a concept of metasurface in nanophotonics. Fano-resonant metasurface (FRM) is attracting a lot of attention due to its superior narrowband characteristics as well as design freedom of metasurfaces in nanoscale. However, only the control of apparent asymmetric spectral nature of Fano resonance has been focused at applications such as optical sensors, as the amplitude feature of Fano resonances is relatively easy to control and can be measured by an experimental setup. Here, a method for modulating the phase information of FRM by both simulation and experiment is demonstrated. As a proof of concept, an optical demultiplexer, which can divide four target wavelengths in different directions of free space, is verified experimentally. It covers a broadband wavelength range of more than 350 nm in the near-infrared region with extremely small full-width at half-maximum. This approach can offer the complete control of FRM for a wide range of applications, including optical multiplexers, routers, filters, and switches, beyond conventional applications that have been limited to the amplitude control of Fano resonance.

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Fano resonances of a ring-shaped “hexamer” cluster at near-infrared wavelength

Physica B Condensed Matter ◽

10.1016/j.physb.2017.12.069 ◽

2018 ◽

Vol 533 ◽

pp. 63-68 ◽

Cited By ~ 1

Author(s):

Tong-Tong Liu ◽

Feng Xia ◽

Peng Sun ◽

Li-Li Liu ◽

Wei Du ◽

...

Keyword(s):

Near Infrared ◽

Fano Resonances ◽

Infrared Wavelength

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Research on Fano Resonance Sensing Characteristics Based on Racetrack Resonant Cavity

Micromachines ◽

10.3390/mi12111359 ◽

2021 ◽

Vol 12 (11) ◽

pp. 1359

Author(s):

Yaxin Yu ◽

Jiangong Cui ◽

Guochang Liu ◽

Rongyu Zhao ◽

Min Zhu ◽

...

Keyword(s):

Integrated Circuits ◽

Fano Resonance ◽

Near Infrared ◽

Resonant Cavity ◽

High Sensitivity ◽

Infrared Region ◽

Optical Integrated Circuits ◽

Element Simulation ◽

Metal Insulator Metal ◽

Sensing Characteristics

To reduce the loss of the metal–insulator–metal waveguide structure in the near-infrared region, a plasmonic nanosensor structure based on a racetrack resonant cavity is proposed herein. Through finite element simulation, the transmission spectra of the sensor under different size parameters were analyzed, and its influence on the sensing characteristics of the system was examined. The analysis results show that the structure can excite the double Fano resonance, which has a distinctive dependence on the size parameters of the sensor. The position and line shape of the resonance peak can be adjusted by changing the key parameters. In addition, the sensor has a higher sensitivity, which can reach 1503.7 nm/RIU when being used in refractive index sensing; the figure of merit is 26.8, and it can reach 0.75 nm/°C when it is used in temperature sensing. This structure can be used in optical integrated circuits, especially high-sensitivity nanosensors.

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Near-infrared dual-wavelength plasmonic switching and digital metasurface unveiled by plasmonic Fano resonance

Nanophotonics ◽

10.1515/nanoph-2020-0511 ◽

2020 ◽

Vol 10 (2) ◽

pp. 947-957

Author(s):

Jie Ou ◽

Xiao-Qing Luo ◽

You-Lin Luo ◽

Wei-Hua Zhu ◽

Zhi-Yong Chen ◽

...

Keyword(s):

Optical Communication ◽

Fano Resonance ◽

Information Transfer ◽

Near Infrared ◽

Induce Polarization ◽

Circular Ring ◽

Dual Wavelength ◽

Unit Cells ◽

Potential Applications ◽

Transmitted Spectrum

AbstractPlasmonic Fano resonance (FR) that contributes to multitudinous potential applications in subwavelength nanostructures can facilitate the realization of tunable wavelength selectivity for controlling light–matter interactions in metasurfaces. However, the plasmonic FR can be generated in metasurfaces with simple or complex geometries, and few of them can support flexible amplitude modulation and multiwavelength information transfer and processing. Here, we study the near-infrared plasmonic FR in a hybrid metasurface composed of concentrically hybridized parabolic-hole and circular-ring-aperture unit cells, which can induce polarization-dependent dual-wavelength passive plasmonic switching (PPS) and digital metasurface (DM). It is shown that the designable plasmonic FR can be realized by changing the geometric configurations of the unit cells. In particular, owing to the polarization-dependent characteristic of FR, it is possible to fulfill a compact dual-wavelength PPS with high ON/OFF ratios in the related optical communication bands. Moreover, such PPS that manipulates the amplitude response of the transmitted spectrum is an efficient way to reveal a 1-bit DM, which can also be rationally extended to a 2-bit DM or more. Our results suggest a pathway for studying polarization-dependent PPS and programmable metasurface devices, yielding possibilities for subwavelength nanostructures in optical communication and information processing.

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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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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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