High-Q Fano Resonances in Asymmetric and Symmetric All-Dielectric Metasurfaces

Liu, Yahong; Luo, Yang; Jin, Xueyu; Zhou, Xin; Song, Kun; Zhao, Xiaopeng

doi:10.1007/s11468-016-0403-2

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…This antisymmetric line shape is formed by the coupling of a discrete and a continuous state, which has been widely studied nowadays [2][3][4]. Fano resonance can be observed in guided mode resonances of waveguide structures [5][6][7] and photonic crystals [8,9], metasurfaces [10][11][12][13][14][15][16], gratings [17], and other * Author to whom any correspondence should be addressed. systems, which is widely used in switching [18], structural color [19,20], high-Q excitation [21], narrow-band filter [22], stimulated surface Raman scattering [23,24] and so on.…”

Section: Introductionmentioning

confidence: 99%

Generalized Fano resonance theory based on Fabry-Perot cavity

Guan,

Liu,

et al. 2024

J. Phys. D: Appl. Phys.

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Fano resonance is a pervasive phenomenon observed across many systems, which has traditionally been interpreted through the coupled harmonic oscillator model. However, the traditional model is limited, especially for different line shapes. In this study, we offer a generalized model by incorporating an imaginary coupling coefficient. This approach fundamentally differs from existing theories by identifying two unique Fano line shapes in the electric field of metallic Fabry-Perot cavity. The model connects the imaginary coupling coefficient with phase distribution of the coupling mode, thus revealing the relationship between Fano line shapes and the trend of phase shifts. This provides a new way for understanding and manipulating Fano resonance. The Fano resonance generation has been validated experimentally through reflection spectra. Our investigation offers a new perspective for understanding of Fano resonance via the coupled harmonic oscillator model and paves a way for the development of dynamically tunable Fano resonance devices.

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Section: Introductionmentioning

confidence: 99%

Generalized Fano resonance theory based on Fabry-Perot cavity

Guan,

Liu,

et al. 2024

J. Phys. D: Appl. Phys.

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“…Fano resonance originally observed in atomic physics is a kind of asymmetric resonance [23], where the interference between a continuum (or broadband) state and a discrete (or narrowband) state of the structure produces a sharp reflection or transmission spectrum for the light with a given polarization direction. Recently, some new strategies based on dielectric structures have been proposed to achieve high quality factor (Q-factor) Fano resonance [24][25][26]. Without the hassle of Ohmic losses, the transmission and reflection spectra of dielectric metasurfaces with Fano resonances can be much narrower than those of plasmonic metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Metasurface generated polarization insensitive Fano resonance for high-performance refractive index sensing

Liu

Zheng

et al. 2019

Opt. Express

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A refractive index sensor can provide refractive index measurement and continuously monitor a dynamic process. Plasmonic nanostructure based sensors suffer from severe metal losses in the optical range, leading to the performance degradation. We design and numerically analyze a high-performance refractive index sensor based on the Fano resonance generated by a dielectric metasurface. The figure of merit (FOM) and the maximum quality factor (Q-factor) of the sensor are 721 and 5126, respectively. The maximum modulation depth can exceed 99% and the enhancement factor of the electric field amplitude can reach a high value of about 100. The uniqueness of the proposed sensor is polarization insensitivity. The transmittance spectra for various polarization states of the incident light can perfectly coincide, which is a rare phenomenon in Fano resonance based sensors and can facilitate experimental measurement.

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“…Fano resonance is a ubiquitous spectral phenomenon that exhibits asymmetric profile due to interference between a discrete (localized) state and a continuum of propagation modes. , Though first realized in an atomic system, the observation of steep spectral lineshapes booms in a great variety of photonic resonating structures, including plasmonic nanocavities, nanoclusters, photonic crystals, gratings, and metamaterials . Most of those structures are composed of elaborately designed resonating parts, − for at least two fundamental resonances should be generated and coupled in a highly controllable way, that is, a broadband resonance to resemble the continuum and a narrowband one to work interactively. Nevertheless, the design complexity, potential applications of photonic Fano resonators in sensors, lasing spacers, optical logic gates, optical filter, and especially optical switches, ,, as well as the rich physics buried in bound states in the continuum, negative optical scattering force, and robust high- Q states of topological photonics, have been continuously intriguing research in this long-lasting topic.…”

mentioning

confidence: 99%

Full Control of Fano Spectral Profile with GST-Based Metamaterial

et al. 2022

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Asymmetric line shape in a spectral profile, quantified by the Fano parameter q, is a hallmark feature of Fano resonances. In photonics, this asymmetry captures the Fano physics of coupling localized resonances to the radiative continuum and nourishes many photonic Fano devices. Recent advances have suggested full control of q from negative infinity to positive infinity; here we realize the negative-to-positive q transition in an active and successive manner using Ge 2 Sb 2 Te 5 (GST)-based Fano resonator in the Mid-infrared. The structure consists of two resonating components: an array of dielectric rectangle resonators on dielectric substrate (for localized resonance) and a GST layer (for radiative continuum), coupled by a conductive spacer. With phase transition of GST, the q parameter can be continuously tuned from 5.2 to 0 to −5.6, which directly maps to the wavelength shifts in the GST resonating layer, that is, the modulation in the continuum. Incorporating geometrical optimization, an arbitrary q value is further achieved. Our Fano resonator also demonstrates a unique narrowband switching property based on the q tuning effect at a wavelength of 5 μm. It performs as a strong reflector of reflection intensity R = 0.77 (with Q = 135) for q = −0.2 and switches to a strong absorber with absorption intensity A = 0.94 (with Q = 190) for q = −5.6. This dynamic interplay between radiative continuum and Fano spectral profile in a vast range of q paves the way for new classes of active photonic devices.

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High-Q Fano Resonances in Asymmetric and Symmetric All-Dielectric Metasurfaces

Cited by 13 publications

References 40 publications

Generalized Fano resonance theory based on Fabry-Perot cavity

Generalized Fano resonance theory based on Fabry-Perot cavity

Metasurface generated polarization insensitive Fano resonance for high-performance refractive index sensing

Full Control of Fano Spectral Profile with GST-Based Metamaterial

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