Fano resonance of an asymmetric dielectric wire pair

Zhang, Fuli; Huang, Xin-Chao; Zhao, Qian; Chen, Lei; Wang, Ying; Li, Qiang; He, Xuan; Li, Chang; Chen, Ke

doi:10.1063/1.4900757

Cited by 71 publications

(35 citation statements)

References 29 publications

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“…Other dual‐particle unit cell systems that have been successful in their demonstrations of high‐ Q Fano resonance include nanocross‐bar, asymmetric double bars, ring‐disk, and concentric rings . By employing the plasmon hybridization model, the evolution of Fano resonance in nanocross‐bar configuration was elegantly pictured with the help of charge density distributions as depicted in Figure b.…”

Section: Classification Of Planar Metallic Fano Systemsmentioning

confidence: 99%

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

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Advances in plasmonic metamaterials have been rapidly evolving with innovations aimed at developing metadevices for real-world applications. In reality, energy losses in plasmonic systems are prevalent and it is of paramount importance to come up with solutions that could overcome the limitations that impede further advancements toward the miniaturization of optoelectronic metadevices. High-Q Fano resonance as a scattering phenomenon can be easily triggered by introducing asymmetry into plasmonic systems, and thus it offers a simple approach for reducing radiative losses through lineshape engineering. High-Q Fano resonance possesses narrow linewidth and intensely confined electromagnetic fields, which makes it viable for widespread applications. The purpose of this review is to consolidate the current advances and contributions that high-Q Fano resonance has made in the metamaterial community. Two general modes of energy loss including radiative and nonradiative losses are introduced and possible ways to overcome these challenges are examined. Furthermore, applications based on high-Q Fano resonance including sensors, lasing spasers, and optical switches are discussed, embracing the future of Fano resonance based high performance photonic technologies.

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Section: Classification Of Planar Metallic Fano Systemsmentioning

confidence: 99%

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

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“…The impact of conductivity on metal FANO structures is studied [23]. Materials other than metal that can be used in FANO structures are proposed, including a nanoscale subwavelength dielectric resonator array [24], an asymmetric ferroelectric wire pair [25] in order to achieve a high-Q factor that can expend the slope of application for all-dielectric meta resonators. Active FANO structures working in the terahertz and the infrared band were also investigated, allowing for a tunable and high-Q factor [26,27].…”

Section: Introductionmentioning

confidence: 99%

Enhanced FANO Structure Based on Tip-Field-Enhancement Theory

Zhou

Zhang

et al. 2019

Applied Sciences

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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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“…By real‐time modulating the resonator's responses in frequency, amplitude, phase and polarization, the tunable metamaterials demonstrate multi‐functionalities, such as programmable metamaterials and optical modulators . Various approaches were proposed to realize the dynamic tunability based on the critical coupling between metamaterials and active materials under the external thermal, optical and electrical excitations . Among them, the graphene shows outstanding abilities, such as broadband operation and ultrafast response speed, by electrically tuning the Fermi energy (or surface conductivity), thanks to the peculiar conical band structure with the high carrier concentration and mobility.…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Modulation of Left‐Handed Passband in Hybrid Graphene/Dielectric Metasurface

et al. 2017

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Large-scale modulation of the left-handed transmission with a high quality factor is greatly desired by high-performance optical devices, but the requirements are hard to be satisfied simultaneously. This paper presents a hybrid graphene/dielectric metasurface to realize a large transmission modulation for the left-handed passband at near-infrared frequencies via tuning the Fermi energy of graphene. By splitting the nanoblocks, i.e. introducing an additional symmetry breaking in the unit cell, the metasurface demonstrates an ultrahigh quality factor (Q 550) of Fano resonance with near-unity transmission and full 2π phase coverage due to the interference between Mie-type magnetic and electric resonances, which induces the negative refraction property. Besides, the split in the nanoblock greatly enhances the local field by increasing the critical coupling area, so the light-graphene interaction is promoted intensively. When the surface conductivity of graphene is electrically tuned, the hybrid graphene/dielectric metasurface exhibits a deep modulation of 85% for the left-handed passband, which is robust even for the highest loss of graphene. Moreover, the simple configuration remarkably reduces the fabrication requirements to facilitate the widespread applications.

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Fano resonance of an asymmetric dielectric wire pair

Cited by 71 publications

References 29 publications

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Enhanced FANO Structure Based on Tip-Field-Enhancement Theory

Large‐Scale Modulation of Left‐Handed Passband in Hybrid Graphene/Dielectric Metasurface

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