Fanolike resonance due to plasmon excitation in linear chains of metal bumps
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We report the transmission anomaly in a modified slit grating, which is dressed, on the slit sidewalls, with the linear chains of metal bumps. An asymmetric lineshape, which is characteristic of the Fano resonance, has been found in a narrow frequency range of the spectrum. The effect can be attributed to the interference between nonresonant background transmission and resonant plasmonic wave excitation in the linear chains. The dispersion of chain plasmon mode has been suggested, enabling the dynamic tuning of spectral position of the Fano effect.Keywords:
Fano resonance
Plasmonic Fano resonances arising from electromagnetic interactions in metallic nanostructures exhibit spectral characteristics analogous to those from the electron waves in oligomer molecules.
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The interaction between plasmonic resonances, sharp modes, and light in nanoscale plasmonic systems often leads to Fano interference effects. This occurs because the plasmonic excitations are usually spectrally broad and the characteristic narrow asymmetric Fano line-shape results upon interaction with spectrally sharper modes. By considering the plasmonic resonance in the Fano model, as opposed to previous flat continuum approaches, here we show that a simple and exact expression for the line-shape can be found. This allows the role of the width and energy of the plasmonic resonance to be properly understood. As examples, we show how Fano resonances measured on an array of gold nanoantennas covered with PMMA, as well as the hybridization of dark with bright plasmons in nanocavities, are well reproduced with a simple exact formula and without any fitting parameters.
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Abstract The rapid developments in nanotechnology and plasmonics allow the manipulation of light at nanometer scales, such as light propagation and resonances. Differing from the symmetric Lorentzian‐like profiles in the conventional resonances, Fano resonances, which originate from the interference of different resonant modes, exhibit obviously asymmetric spectral profiles. Based on lineshape engineering, the Fano resonances with sharp asymmetric profiles exhibit a small linewidth and a high spectral contrast by exploiting different mechanisms and designing various metallic nanostructures. Both of the above properties in the sharp Fano resonances have significant applications in nanoscale plasmonic sensors and modulators. This review summarizes the underlying mechanism of the Fano resonances in various metallic nanostructures. Then, practical applications of the Fano resonances in nanoscale plasmonic sensing and modulation are reviewed. At last, the development and challenges of plasmonic sensing and modulation based on Fano resonances are discussed.
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We explore the possibility of strongly influencing the plasmon damping time in nanostructures for efficient second harmonic generation (SHG), using the tunability of the narrow linewidth feature in the scattering cross-section of Fano resonant systems.
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Plasmonic sensing and modulation with Fano resonances have been the hot topics in the field of Plasmonic Devices over the past decades. Jianjun Chen and co-workers have made a significant contribution to this field. In their “Hall of Fame” article number 1701152, they summarize the underlying mechanism of Fano resonances and review their applications in plasmonic sensing and modulation.
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The interaction between plasmonic resonances, sharp modes, and light in nanoscale plasmonic systems often leads to Fano interference effects. This occurs because the plasmonic excitations are usually spectrally broad and the characteristic narrow asymmetric Fano line-shape results upon interaction with spectrally sharper modes. We investigate a plasmonic waveguide system using the finite-difference time-domain method, which consists of a metal-insulator-metal waveguide coupled with a circle and a disk cavity. Numerical simulations results show that the sharp and asymmetric Fano-line shapes can be created in the waveguide. Fano resonance strongly depends on the structural parameters. This has important applications in highly sensitive and multiparameter sensing in the complicated environments.
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The unique properties of plasmonic Fano resonances have drawn extraordinary attention owing to their potential for interesting applications in biochemical sensing, slow light devices, near-field enhancement, and active plasmonics. Recent experiments have demonstrated that Fano resonances can be generated from a plasmonic nanocluster (nano-blossom) due to the destructive interference of the superradiant and subradiant modes [1]. Such Fano resonances can be tailored by varying the relative dimensions of the central and peripheral disks [1] as well as be switched on and off by replacing the center disk with a semicircle or by rotating the polarization of the incident light [2]. In this work, we demonstrate a novel plasmonic Fano system, which can be actively regulated by hydrogen. The structure comprises magnesium (Mg) and gold (Au) nanoparticles (see Figure 1a). The active functionality is enabled due to the fact that Mg nanoparticles can undergo a phase transition from metallic (Mg) to dielectric state (MgH 2 ) when absorbing hydrogen [3,4]. Importantly, the process is fully reversible upon oxygen exposure.
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Multiple Fano interferences in a plasmonic metamolecule consisting of asymmetric metallic nanodimers
We theoretically explore signatures of plasmonic Fano interferences in a subwavelength plasmonic metamolecule consisting of closely packed asymmetric gold nanodimers, which lead to the possibility of generating multiple Fano resonances in the scattering spectrum. This spectral feature is attributed to the interference between bright and dark plasmonic modes sustained by the constituent nanodimers. The excited Fano dips are highly sensitive in both wavelength and amplitude to geometry and background dielectric medium. The tunability of induced Fano resonances associated with enhanced electric fields from the visible to infrared region provides promising applications, particularly in refractive index sensing, light-trapping, and photon up-converting.
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