Geometry symmetry-free and higher-order optical bound states in the continuum

Zhou, Qingjia; Fu, Yangyang; Huang, Lujun; Wu, Qiannan; Miroshnichenko, Andrey E.; Gao, Lei; Xu, Yadong

doi:10.1038/s41467-021-24686-5

Cited by 31 publications

(12 citation statements)

References 48 publications

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“…[27,28] The nonexistence theorem [1] claims that single-particle BICs are usually forbidden in compact systems, excluding structures surrounded by hard walls or zero index metamaterials. [29][30][31][32][33] However, the former is useless because the resonators are opaque and inaccessible from the outside excitation and the latter is trivial to some contents for BIC-based applications due to material losses. Different from an infinite structure, there are, generally, infinite scattering channels in a finite structure, which are obstacles to achieving BICs with finite tuning parameters.…”

Section: Doi: 101002/adom202201590mentioning

confidence: 99%

Plasmonic Bound States in the Continuum in Compact Nanostructures

Zhou

Liu

et al. 2022

Advanced Optical Materials

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Optical bound states in the continuum (BICs) have become a unique way to produce the extreme localization and enhancement of light waves, however, it remains challenging to realize them in single‐particle systems. This work shows the existence of optical BICs in a compact corrugated metallic cylinder, and quasi‐BICs are observed in multiple channels when adjacent grooves have different depths. It is revealed that such BICs are purely plasmonic, resulting from the destructive interference of two localized surface plasmon modes in the nanostructures. Benefiting from the surface plasmon effects, the findings extend optical BICs and the associated physics to subwavelength optics, providing a route to break the diffraction limit and boost light–matter interactions.

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Section: Doi: 101002/adom202201590mentioning

confidence: 99%

Plasmonic Bound States in the Continuum in Compact Nanostructures

Zhou

Liu

et al. 2022

Advanced Optical Materials

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“…The practical solution to the problem of the creation of emitting devices based on Mie resonances can be the use of quasi-trapped modes (QTMs) in metasurfaces composed of high refractive index NPs. Note that the QTMs correspond to the eigenstates of the system, are characterized by high quality factor, − are detected via narrow features in the reflection/transmission spectra, and allow achieving the extremely high values of the near field inside and nearby the building blocks of the metasurface. Therefore, the metasurfaces operating in the regime of QTM generation are promising for observation and control of nonlinear optical processes and can be utilized as distributed resonators and for the realization of the efficient pumping of emitting centers loaded into the metasurface.…”

Section: Introductionmentioning

confidence: 99%

Design and Tuning of Substrate-Fabricated Dielectric Metasurfaces Supporting Quasi-Trapped Modes in the Infrared Range

et al. 2023

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Optical metasurfaces supporting resonances of trapped modes allow obtaining narrow features in their reflection and transmission spectra and are the technological basis for the fabrication of highly sensitive sensor coatings and near-field pumping systems for two-dimensional lasers. In the present work, we propose and experimentally verify the strategy for tuning the parameters of an all-dielectric metasurface placed on the substrate in order to implement the narrow resonance of a quasi-trapped mode (QTM) at the required wavelength. We use a Si disk with an eccentric hole as a building block irradiated by a linearly polarized plane wave normally incident to the disk’s base. In this case, the normal components of the magnetic dipole moment are excited due to the bianisotropic response in the system. Using the electrostatic approximation for the polarizability of a single disk and solving the equation for the self-consistent dipole response of a lattice composed of such disks, we plot the parametric curve in the plane (wavelength vs geometric size of the disk) that corresponds to the conditions of QTM excitation accounting for the overcoming effect of diffraction into the substrate. Fixing the arbitrary wavelengths from the infrared (IR) range of the spectrum, we use this curve to select the disk’s size and the period of the metasurface, which are the basis for the fabrication of the necessary metasurfaces. Analyzing the reflection spectra of the fabricated metasurfaces, we observe the narrow spectral features at given wavelengths and, using numerical simulation, identify them as QTM resonances. We demonstrate the polarization control of the amplitudes of the QTM, which allows switching of the intensity value of the electric field on the surface of the Si disks.

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“…Accidental BICs are usually excited by destructive interferences between isolated resonances [29,30]. Over the last decade, much research has examined the transformation from ideal BIC into leaky quasi-BICs by fine-breaking structural symmetry or varying angle of incidence [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

Xie

Bai

et al. 2022

IEEE Photonics J.

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Bound state in the continuum (BIC), as a novel eigenmode with infinitely high-quality factor, has received great attention in modern optical science. Mode coupling in dielectric metasurfaces opens possibilities in searching for robust BICs. Here, we discover multiple BICs in periodic dielectric resonators composed of a silicon rectangular bar and a silicon ring in one lattice. For the symmetry-protected BIC at-Γ point, a sharp electromagnetically induced transparency window can be formed by either tilting incident angle to induce the 'bright-bright' mode coupling, or by displacing the ring to generate the 'bright-dark' mode coupling. Besides, the coupling between two resonators leads to a new energy band in the dielectric metasurface. As a result, two off-Γ BICs are formed owing to avoided crossings with two energy bands, and another one belongs to the single-resonance parametric BIC. Thus, our coupled resonators possess superior abilities to judiciously engineer BICs via versatile physical mechanisms. Taking advantage exclusively of coupled resonators in dielectric metasurfaces provides fresh insights into the creation of both symmetry-protected and accidental BICs, which enables profound advancements in designing novel photonic devices.

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Geometry symmetry-free and higher-order optical bound states in the continuum

Cited by 31 publications

References 48 publications

Plasmonic Bound States in the Continuum in Compact Nanostructures

Plasmonic Bound States in the Continuum in Compact Nanostructures

Design and Tuning of Substrate-Fabricated Dielectric Metasurfaces Supporting Quasi-Trapped Modes in the Infrared Range

Multiple Photonic Bound States in the Continuum in an Electromagnetically Induced Transparency Metasurface

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