Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials

Song, Haojie; Fei, Guang Tao; Wang, Junfeng; Jiang, Kang; Wang, Pei; Lu, Yonghua; Iorsh, Ivan; Wei, Xu; Jia, Junhui; Zhang, Lide; Kivshar, Yuri S.; Zhang, Lin

doi:10.1088/0957-4484/27/41/415708

Cited by 18 publications

(21 citation statements)

References 41 publications

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“…As can been seen in Fig. 3, the electric field is highly concentrated and enhanced around the corner of the metallic groove, and its direction is nearly parallel to the x -axis, corresponding to an electric dipole resonance mode [44, 45]. On the contrary, the magnetic field is strongly enhanced in the cavity of the metallic groove, and its direction is perpendicular to the xoz -plane, corresponding to a magnetic dipole resonance mode [26, 46].…”

Section: Resultsmentioning

confidence: 99%

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

et al. 2019

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An angle-insensitive broadband absorber of graphene covering the whole visible spectrum is numerically demonstrated, which is resulted from multiple couplings of the electric and magnetic dipole resonances in the narrow metallic grooves. This is achieved by integrating the graphene sheet with a multi-grooved metasurface separated by a polymethyl methacrylate (PMMA) spacer, and an average absorption efficiency of 71.1% can be realized in the spectral range from 450 to 800 nm. The location of the absorption peak of graphene can be tuned by the groove depth, and the bandwidth of absorption can be flexibly controlled by tailoring both the number and the depth of the groove. In addition, broadband light absorption enhancement of graphene is robust to the variations of the structure parameters, and good absorption properties can be maintained even the incident angle is increased to 60°.Electronic supplementary materialThe online version of this article (10.1186/s11671-019-2937-7) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

et al. 2019

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“…Near-field mode coupling of the plasmonic nanorod metamaterials consisting of the silver nanorod arrays has been investigated in our previous work 13 . Reflectance measurements reveal the existence of multiple resonance modes of the nanorod metamaterials.…”

Section: Resultsmentioning

confidence: 99%

“…It has been noted that the conventional metal nanostrips as cavities with single metal-dielectric interfaces have large Ohmic losses [8][9][10][11] . Whereas enhancement of plasmonic near-field coupling by designing two or multi metal-dielectric interfaces can decrease the Ohmic losses [12][13][14][15] . In this case, the plasmonic resonant cavities with the two or multi metal-dielectric interfaces can be expected to be applied in some optical devices.…”

Section: Introductionmentioning

confidence: 99%

Resonance modes of plasmonic nanorod metamaterials and their applications

Xie

Wei

et al. 2019

AOPC 2019: Nanophotonics

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Plasmonic nanorod metamaterials exhibit transversal and longitudinal resonance modes. It is found that the resonance intensity of the transversal modes (T-Modes) excited by the p-polarized wave is obviously larger than the intensity for the s-polarized wave at the wavelength of the transversal resonance, and the resonance intensity of the longitudinal modes (L-Modes) excited by the s-polarized wave is clearly larger than the intensity for the p-polarized wave at the longitudinal resonance wavelength, indicating a distinct polarization characteristics, which results from excitation of the different resonance modes of surface plasmons at different wavelengths. Moreover, the polarization behavior in near field regions for the different resonance modes has been demonstrated by the electric field distributions of the plasmonic nanorods based on FDTD simulation. In addition, the working wavelength of the polarizer can be tuned by the diameter and length of the silver nanorods in the visible spectral range, higher extinction ratios and lower insertion losses can be achieved based on the different resonance modes associated with the different polarizations. The polarizers will be a promising candidate for its potential applications in integration of nanophotonic devices.

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“…Obtained results show that silver is more convenient in terms of plasmonic applications. It is characterized by a low Ohmic loss and a large absolute value of the real part of dielectric permittivity in the visible frequency range (Song et al, 2016). This results in lower decay rates so that it is believed that silver is stronger than gold from the field localization point of view.…”

Section: Figure 4 | (A)mentioning

confidence: 99%

Enhanced Plasmonic Resonance Characteristics of AgNRs–Gold Film Hybrid System

et al. 2021

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In recent years, the plasma gap resonance maintained by metal-film-coupled nanostructures has attracted extensive attention. This mainly originates from its flexible control of the spectral response and significantly enhanced field strength at the nanoparticle–film junction. In the present study, the tunability of local surface plasmon resonances (LSPRs) of nanorods coupled to a gold film is studied theoretically. To this end, the plasmonic resonances in the nanostructure of individual silver nanorod–gold film (AgNR-film) with different parameters are investigated. Obtained results show that the refractive index sensitivity (S) of nanostructures to the environment increases as the aspect ratio (Ar) of nanostructures increase. It is found that when the aspect ratio (Ar) is set to 3.5, the figure of merit (FOM) is the highest. Moreover, the variation in the gap distances of the nanorod monomer–gold film, electric field distribution of nanorods dimer, and the corresponding impact on the gold film are studied. It is concluded that the gap size of nanostructures has an exponential correlation with the resonance wavelength. Considering the remarkable influence of the gap size and the surrounding medium environment on the spectral shift of AgNR-film nanostructures, potential applications of the structure as a refractive index sensor and biomolecule measurement are proposed.

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Near-field coupling and resonant cavity modes in plasmonic nanorod metamaterials

Cited by 18 publications

References 41 publications

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

Angle-Insensitive Broadband Absorption Enhancement of Graphene Using a Multi-Grooved Metasurface

Resonance modes of plasmonic nanorod metamaterials and their applications

Enhanced Plasmonic Resonance Characteristics of AgNRs–Gold Film Hybrid System

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