Imaging Through a Fano-Resonant Dielectric Metasurface Governed by Quasi--bound States in the Continuum

Zhou, Chaobiao; Qu, Xiaoying; Xiao, Shuyuan; Fan, Mingming

doi:10.1103/physrevapplied.14.044009

Cited by 76 publications

(26 citation statements)

References 62 publications

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“…2 (a) presents the simulated transmission spectrum (blue line) at a radius of the off-centered hole r = 50 nm. we can find that it shows an asymmetric line-shape Fano resonance with a dip around 616 nm, and the simulation result is well fitted (red line) by the Fano formula 36,43,44 , which suggests that the quasi-BIC obtains an energy exchange with the continuum free-space radiation modes. The near field distribution is plotted in the inset of Fig.…”

Section: Resultsmentioning

confidence: 56%

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

Qin,

Duan,

Xiao

et al. 2021

Preprint

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Section: Resultsmentioning

confidence: 56%

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

Qin,

Duan,

Xiao

et al. 2021

Preprint

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“…In photonic metastructures realm, this type of Fano or toroidal resonances has been categorized as high-Q quasi-BICs (Q-BIC). Augmentation of optical nonlinearities, [416][417][418] light guiding, [419] beam shaping, [420] quantum photonics, [421] and sensing and imaging [422,423] are some of important use cases of Q-BIC resonant metastructures. In Figure 15, sketches of several types of recently proposed Q-BIC metamaterials and resonators are demonstrated.…”

Section: Quasi-bound States In the Continuum (Q-bic) Metasensorsmentioning

confidence: 99%

Photonic and Plasmonic Metasensors

Ahmadivand

Gerislioglu

2021

Laser & Photonics Reviews

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Biosensors have been designed and developed for detecting biomarkers, biomolecules, proteins, enzymes, organisms, and various types of bacterial and viral diseases since the turn of the century. Initially marred by poor sensitivity, specificity, and selectivity, the advent of the notion of photonic biosensors has successfully addressed such drawbacks. One of the hallmarks of modern pharmaceutical industries is the miniaturization of photonic platforms via continuous scaling down of their sizes, which was accomplished by leveraging the concept of artificial media. Numerous forms of photonic and plasmonic devices have been configured for next-generation technologies since the emergence of metamaterials. Among diverse applications, the development of cost-effective, label-free, selective, precise, and on-chip immunobiosensors with rapid sample-to-result feature has received copious interest, recently. This focused Review brings clarity to the rapidly growing body of available and in-development metamaterials-enabled diagnostic instruments based on inventive and promising approaches. Through centering on the operating principles of plasmonic, photonic, and hybrid metasensors, we mechanistically characterize and describe the properties of such tools and summarize the most recent achievements in devising metasensors and bioimaging tools with high precision. This insightful understanding serves as a comprehensive source for scientists, physicians, and students to construct ultradense and high-throughput clinical screening metadevices.

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“…In recent years, BICs are also widely found in all-dielectric metasurfaces [ 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. It is noted that, after introducing the symmetry perturbation in nanostructures, the nonradiative BICs can be transformed into radiative quasi-BICs, accompanied by the occurrence of sharp Fano resonances with high Q-factors [ 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ], which have been developed in nonlinear optics [ 69 , 70 , 71 , 72 , 73 , 74 ], imaging and sensing [ 75 , 76 , 77 , 78 ], light emission manipulation and lasing [ 79 , 80 , 81 ], and so on. Quasi-BICs can exhibit a strong coupling of multipoles and may enrich the manipulation of the far-field scattering pattern [ 82 ].…”

Section: Introductionmentioning

confidence: 99%

Manipulating Optical Scattering of Quasi-BIC in Dielectric Metasurface with Off-Center Hole

Zhou

Huang

et al. 2021

Nanomaterials

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Bound states in the continuum (BICs) correspond to a particular leaky mode with an infinitely large quality-factor (Q-factor) located within the continuum spectrum. To date, most of the research work reported focuses on the BIC-enhanced light matter interaction due to its extreme near-field confinement. Little attention has been paid to the scattering properties of the BIC mode. In this work, we numerically study the far-field radiation manipulation of BICs by exploring multipole interference. By simply breaking the symmetry of the silicon metasurface, an ideal BIC is converted to a quasi-BIC with a finite Q-factor, which is manifested by the Fano resonance in the transmission spectrum. We found that both the intensity and directionality of the far-field radiation pattern can not only be tuned by the asymmetric parameters but can also experience huge changes around the resonance. Even for the same structure, two quasi-BICs show a different radiation pattern evolution when the asymmetric structure parameter d increases. It can be found that far-field radiation from one BIC evolves from electric-quadrupole-dominant radiation to toroidal-dipole-dominant radiation, whereas the other one shows electric-dipole-like radiation due to the interference of the magnetic dipole and electric quadrupole with the increasing asymmetric parameters. The result may find applications in high-directionality nonlinear optical devices and semiconductor lasers by using a quasi-BIC-based metasurface.

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Imaging Through a Fano-Resonant Dielectric Metasurface Governed by Quasi--bound States in the Continuum

Cited by 76 publications

References 62 publications

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

Manipulating strong coupling between exciton and quasi-bound states in the continuum resonance

Photonic and Plasmonic Metasensors

Manipulating Optical Scattering of Quasi-BIC in Dielectric Metasurface with Off-Center Hole

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