Displacement-mediated bound states in the continuum in all-dielectric superlattice metasurfaces

Shi, Tan; Deng, Zi‐Lan; Tu, Qing-An; Li, Xiangping

doi:10.1186/s43074-021-00029-x

Cited by 49 publications

(27 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, significant research interest has been devoted to the physics of photonic bound states in the continuum (BICs) which allow achieving exceptionally high Q resonances in both individual particles and metasurface platforms. − In mathematics, BICs with infinite Q factors occur when the couplings between the discrete eigenstates and all radiative channels vanish . In practice, BICs often transform into quasi-BIC resonances with finite, yet high and controllable, Q factors usually bounded in finite-size systems and are also due to dissipative and radiative losses.…”

mentioning

confidence: 99%

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Liang

Lin

et al. 2021

Nano Lett.

View full text Add to dashboard Cite

Plasmonic metasurfaces supporting collective lattice resonances have attracted increasing interest due to their exciting properties of strong spatial coherence and enhanced light−matter interaction. Although the focusing of light by high-numerical-aperture (NA) objectives provides an essential way to boost the field intensities, it remains challenging to excite high-quality resonances by using high-NA objectives due to strong angular dispersion. Here, we address this challenge by employing the physics of bound states in the continuum (BICs). We design a novel anisotropic plasmonic metasurface combining a two-dimensional lattice of high-aspect-ratio pillars with a one-dimensional plasmonic grating, fabricated by a two-photon polymerization technique and gold sputtering. We demonstrate experimentally multiple resonances with absorption amplitudes exceeding 80% at mid-IR using an NA = 0.4 reflective objective. This is enabled by the weak angular dispersion of quasi-BIC resonances in such hybrid plasmonic metasurfaces. Our results suggest novel strategies for designing photonic devices that manipulate focused light with a strong field concentration.

show abstract

mentioning

confidence: 99%

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Liang

Lin

et al. 2021

Nano Lett.

View full text Add to dashboard Cite

show abstract

“…Metasurfaces have attracted considerable attention due to their ability to control light propagation and light localization [ 1 , 2 , 3 ]. Using design methods for structural parameters of metacells, metasurfaces can be developed for many applications, such as beam splitters [ 4 ], holograms [ 5 ], ultra-narrow-band absorbers [ 6 , 7 ], filters, sensors [ 8 , 9 ], etc.…”

Section: Introductionmentioning

confidence: 99%

“…In optics, an ideal BIC is decoupled from other radiative modes so that it is optically unobservable due to its zero linewidth and infinite Q factor [ 15 ]. In different metasurface systems, BICs can be divided into two typical patterns: symmetry-protected BICs and accidental BICs [ 3 ]. The latter can realize radiation suppression by tuning the structural parameters when the number of radiative channels is small.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum

Fan

Sun

et al. 2023

Materials

View full text Add to dashboard Cite

The bound state in the continuum (BIC) has paved a new way to achieve excellent localization of the resonant mode coexisting with a continuous spectrum in the metasurface. Here, we propose an all-dielectric metasurface consisting of periodic pairs of asymmetric crosses that supports multiple Fano resonances. Due to the sufficient degrees of freedom in the unit cell, we displaced the vertical bars horizontally to introduce in-plane perturbation, doubling the unit cell structure. Dimerization directly resulted in the folding of the Brillouin zone in k space and transformed the BIC modes into quasi-BIC resonances. Then, simultaneous in-plane symmetry breaking was introduced in both the x and y directions to excite two more resonances. The physical mechanisms of these BIC modes were investigated by multipole decomposition of the scattering cross section and electromagnetic near-field analysis, confirming that they are governed by toroidal dipole (TD) modes and magnetic dipole (MD) modes. We also investigated the flexible tunability and evaluated the sensing performance of our proposed metasurface. Our work is promising for different applications requiring stable and tunable resonances, such as optical switching and biomolecule sensing.

show abstract

“…These states, known as “bound states in the continuum” (BIC), are characterized by the resonant frequencies (bound states) lying in the continuum spectrum of radiating modes of the structure . In theory, a BIC can be considered as a resonance with zero line-width or infinite quality factor Q ; however, for real systems, it is limited because of material absorption, technological imperfections, roughness, the finite lateral size of samples, and leakage into the substrate . Some applications of BICs can be seen in hyperspectral imaging, mirrorless lasing, ultrafast all-optical switching, or nonlinear harmonic generation. , …”

Section: Introductionmentioning

confidence: 99%

Angular Transmission Response of In-Plane Symmetry-Breaking Quasi-BIC All-Dielectric Metasurfaces

et al. 2022

View full text Add to dashboard Cite

High-index dielectric metasurfaces have gradually become one of the most promising platforms in the field of nanophotonics due to the ease in engineering their optical behavior and their small size. Several numerical and experimental studies have been conducted in the fields of plasmonic metasurfaces and dielectric metasurfaces on in-plane symmetry-breaking nanodisk metasurfaces supporting high-Q states called "quasi-BICs", where these devices are useful for applications such as imaging and biodetection. This article studies numerically and experimentally symmetry-breaking metasurfaces made of amorphous silicon (α-Si) nanodisks in the visible-to-near-infrared range. It is reported that the angular response of the quasi-BICs for type I symmetrybreaking metasurfaces can be blue-shifted with respect to incident light tilted parallel to the axis of mirror symmetry and red-shifted when tilted perpendicular to it due to changes in the in-plane momentum. Comparatively, the angular response of the quasi-BICs of type II symmetry-breaking metasurfaces can only be redshifted due to mirror symmetries in both axis directions.

show abstract

Displacement-mediated bound states in the continuum in all-dielectric superlattice metasurfaces

Cited by 49 publications

References 49 publications

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum

Angular Transmission Response of In-Plane Symmetry-Breaking Quasi-BIC All-Dielectric Metasurfaces

Contact Info

Product

Resources

About