Near-infrared Fano resonance in asymmetric silicon metagratings

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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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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Near infrared plasmonic sensor based on Fano resonance

10.1117/12.2214216 ◽

2016 ◽

Author(s):

S. M. Sherif ◽

L. Shahada ◽

D. C. Zografopoulos ◽

R. Beccherelli ◽

M. Swillam

Keyword(s):

Fano Resonance ◽

Near Infrared ◽

Plasmonic Sensor

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Numerical analysis of near-infrared plasmonic filter with high figure of merit based on Fano resonance

Applied Physics Express ◽

10.7567/apex.10.082201 ◽

2017 ◽

Vol 10 (8) ◽

pp. 082201 ◽

Cited By ~ 5

Author(s):

JingJing Mao ◽

Xiang Zhai ◽

LingLing Wang ◽

HongJu Li

Keyword(s):

Numerical Analysis ◽

Fano Resonance ◽

Figure Of Merit ◽

Near Infrared ◽

Plasmonic Filter ◽

High Figure

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Multiple Fano Resonance Excitation of All-Dielectric Nanoholes Cuboid Arrays in Near Infrared Region

Results in Physics ◽

10.1016/j.rinp.2021.104569 ◽

2021 ◽

pp. 104569

Author(s):

Shilin Yu ◽

Hao Li ◽

Yusen Wang ◽

Ziang Gao ◽

Tonggang Zhao ◽

...

Keyword(s):

Fano Resonance ◽

Near Infrared ◽

Infrared Region ◽

Resonance Excitation ◽

Near Infrared Region

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Fano Resonance Enhanced Surface Plasmon Resonance Sensors Operating in Near-Infrared

Photonics ◽

10.3390/photonics5030023 ◽

2018 ◽

Vol 5 (3) ◽

pp. 23 ◽

Cited By ~ 9

Author(s):

Tianye Huang ◽

Shuwen Zeng ◽

Xiang Zhao ◽

Zhuo Cheng ◽

Perry Shum

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Fano Resonance ◽

High Performance ◽

Near Infrared ◽

Electromagnetically Induced Transparency ◽

Signal To Noise Ratio ◽

Phase Sensitivity ◽

Sensing Applications

In the phase-sensitivity-based surface plasmon resonance (SPR) sensing scheme, the highest phase jump usually happens at the darkness or quasi-darkness reflection point, which results in low power for detection. To overcome such a limitation, in this paper, a waveguide-coupled SPR configuration is proposed to work at near-infrared. The coupling between surface plasmon polariton (SPP) mode and photonic waveguide (PWG) mode results in electromagnetically induced transparency (EIT) and asymmetric Fano resonance (FR). Near the resonance, the differential phase between p-polarized and s-polarized incident waves experience drastic variation upon change of the surrounding refractive index. More importantly, since the FR occurs at the resonance slope of SPP mode, the corresponding phase change is accompanied with relatively high reflectivity, which is essential for signal-to-noise ratio (SNR) enhancement and power consumption reduction. Phase sensitivity up to 106 deg/RIU order with a minimum SPR reflectivity higher than 20% is achieved. The proposed scheme provides an alternative approach for high-performance sensing applications using FR.

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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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Active Manipulation of Fano Resonance at Visible and Near-Infrared Wavelengths in Metal Plasmonic Nanodevices Using Graphene

10.21203/rs.3.rs-177081/v1 ◽

2021 ◽

Author(s):

Yuan Wan ◽

Jing Lyu ◽

Xinyu Zhang ◽

Zhaozhong Meng

Keyword(s):

Fano Resonance ◽

Near Infrared ◽

High Sensitivity ◽

Blue Shift ◽

Resonance Wavelength ◽

Original Method ◽

Near Ir ◽

Reflected Light ◽

Infrared Wavelengths ◽

Significant Blue Shift

Abstract Active manipulation of Fano resonance at visible and near-IR wavelengths in metal nanodevices is one of the important challenges for applications such as chemical and biological sensing. Here, we theoretically research an active manipulation of Fano resonance at visible and near-IR wavelengths in gold plasmonic nanodevices with graphene. The surface plasmon resonance of the gold plasmonic nanodevice with graphene has three resonance peaks, and this can be explained by the distribution of the electric field in the nanodevice. The Fano resonance wavelength of the gold plasmonic nanodevice with graphene has a significant blue-shift compared with the gold nanodevices without graphene. Moreover, the Fano resonance dependens on the length and position of Au nanorods and the environment refractive index. The figure of merit of the gold nanodevice with graphene can be as high as 41.3, which makes the system suitable for high sensitivity applications. Finally, we actively manipulate the absorption spectrum and the reflected light phase through changing the Fermi energy of graphene. These results suggest an original method for the design of an actively manipulated Fano resonance nanodevice.

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