Demonstration of sharp multiple Fano resonances in optical metamaterials

Moritake, Yuto; Kanamori, Yoshiaki; Hane, Kazuhiro

doi:10.1364/oe.24.009332

Cited by 35 publications

(23 citation statements)

References 28 publications

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“…He discovered that the shape of this resonance, which is based on the interaction of a discrete excited state of an atom with a continuum of scattering states, is quite different from the resonance which generally described by the Lorentzian formula. Because of the asymmetry of the Fano line-shape and the enhanced interference effect, many theoretical47484950515253 and experimental545556575859 works have be done so far.…”

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confidence: 99%

Optical multistability and Fano line-shape control via mode coupling in whispering-gallery-mode microresonator optomechanics

Zhang

Wang

et al. 2017

Sci Rep

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We study a three-mode (i.e., a clockwise mode, a counterclockwise mode, and a mechanical mode) coherent coupling regime of the optical whispering-gallery-mode (WGM) microresonator optomechanical system by considering a pair of counterpropagating modes in a general case. The WGM microresonator is coherently driven by a strong control laser field and a relatively weak probe laser field via a tapered fiber. The system parameters utilized to explore this process correspond to experimentally demonstrated values in the WGM microresonator optomechanical systems. By properly adjusting the coupling rate of these two counterpropagating modes in the WGM microresonator, the steady-state displacement behaviors of the mechanical oscillation and the normalized power transmission and reflection spectra of the output fields are analyzed in detail. It is found that the mode coupling plays a crucial role in rich line-shape structures. Some interesting phenomena of the system, including optical multistability and sharp asymmetric Fano-shape optomechanically induced transparency (OMIT), can be generated with a large degree of control and tunability. Our obtained results in this study can be used for designing efficient all-optical switching and high-sensitivity sensor.

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confidence: 99%

Optical multistability and Fano line-shape control via mode coupling in whispering-gallery-mode microresonator optomechanics

Zhang

Wang

et al. 2017

Sci Rep

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“…Lattices composed of two different sizes of SRRs placed in the diagonal and anti‐diagonal axis of the unit cell have shown to excite multiple Fano resonances in a single plasmonic system at THz frequencies . This is also applicable to Fano resonators at other regimes of the electromagnetic spectrum . Based on quantitative analysis of surface currents ( Figure a), the Fano‐like asymmetric lineshape of trapped modes f1 and f2 correspond to the resonance modes driven in the larger SRRs and smaller SRRs, respectively.…”

Section: Classification Of Planar Metallic Fano Systemsmentioning

confidence: 91%

“…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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“…In addition to the abovementioned problem related to the resonant nature of the Fano resonance, studies for controlling the resonance characteristics are also an important issue since it provides large tunability and flexibility for a variety of practical applications, such as optical sensor, elector‐optic modulator, and ultrasensitive spectroscopy . Most previous studies have controlled the line width, spectral position, and depth of the Fano resonances and demonstrated their multiple modes based on a passive method of geometric parameter sweep, which have very limited tuning range . There are some schemes using phase change materials/graphene, electromechanical control, and photo‐excited method .…”

Section: Introductionmentioning

confidence: 99%

Enhancement and Switching of Fano Resonance in Metamaterial

Mun

Yun

Choi

et al. 2018

Advanced Optical Materials

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of resonant scattering phenomenon that makes asymmetric line shape originating from destructive interference between broadband scattering within a continuum state (bright superradiant mode) and an excitation of discrete state (dark subradiant mode) similar to coupled oscillator system. It was firstly observed in scattering phenomenon of electrons from helium atom by Ugo Fano. [2] Since then, Fano-type resonances have been studied in many physical systems including not only classical atomic systems but also nanophotonic systems such as the field of plasmonics, photonic crystals, and metamaterials due to its unique narrow and asymmetric line shapes nature. [3,4] Recently, Fano-type spectral response in plasmonic nanostructures and metamaterials have attracted considerable attention due to its superior capability to manipulate various characteristics of the Fano resonance in a broad frequency range, which is applicable for practical applications including chemical or biosensing, nonlinear optics, slow light device, and spectroscopy. [5,6] Numerous metallic or dielectric metamateirals have been designed to demonstrate Fano resonances using a common method of breaking the structural symmetry of nanostructures, such as split-ring resonators, [7] asymmetric double bars, [8][9][10] nanoparticle clusters, [11,12] dolmen structures, [13] and hybridized structures. [14][15][16][17] Despite the superior capability of the Fano resonant metamaterials, a trade-off between the quality factor (Q factor) and resonance intensity is unfortunately inevitable. Numerous high Q metamaterials have been proposed so far. [18][19][20] However, as the Q factor increases with an extremely narrow line width, the resonance intensity decreases simultaneously, causing it difficult to detect or distinguish sharp and minute resonances that limit application possibilities. It is an important issue of the high Q metamaterials and is being investigated in a way that defines the Figure of merit (FoM) as the product of the Q factor and intensity. [21] This approach, however, does not solve the tradeoff problem, but suggest only an appropriate region where the two values are moderately high by defining the FoM. The way to resolve the trade-off relation still remains a problem. In addition to the abovementioned problem related to the resonant nature of the Fano resonance, studies for controlling the resonance characteristics are also an important issue since it provides large tunability and flexibility for a variety of practical applications, such as optical sensor, elector-optic modulator, and ultrasensitive Excitation and manipulation of Fano resonances in plasmonic nanostructure have attracted considerable attention due to its capability of degrees of freedom in artificial design especially for spectral positions and quality factors (Q factors). To utilize the high Q factor of Fano resonances in practical applications, their sharp peaks or dips should be well detected, which means a high intensity of resonance line shape. Thus far, the realization of F...

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Demonstration of sharp multiple Fano resonances in optical metamaterials

Cited by 35 publications

References 28 publications

Optical multistability and Fano line-shape control via mode coupling in whispering-gallery-mode microresonator optomechanics

Optical multistability and Fano line-shape control via mode coupling in whispering-gallery-mode microresonator optomechanics

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Enhancement and Switching of Fano Resonance in Metamaterial

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