Bound States in the Continuum in a T-Shape Nanohole Array Perforated in a Photonic Crystal Slab

Xie, Suxia; Xie, Song; Zhan, Jie; Xie, Changzhong; Тиан, Ганг; Z, Li; Liu, Qiong

doi:10.1007/s11468-020-01140-8

Cited by 17 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ha et al [19] excited vertical electric dipole resonances in GaAs nanocolumn arrays to achieve non-radiative BICs. There are also asymmetric rectangular bars with different lengths [20] or widths [21], asymmetric dimer disks with different radii [22], and T-shaped [23], tetramer [24], and hexamer nanodisks [25] with different configurations and distributions, which generate quasi-BICs through near-field interactions using interpolymer gaps in the superlattice. There are also different configurations and distributions of asymmetric rectangular bars with different lengths [20] or widths [21], asymmetric dimer disks with different radii [22], and shape-varying T-shaped [23], tetramer [24], and hexamer nanodiscs [25], which generate quasi-BICs by exploiting the nearfield interactions between the polymers in the superlattice.…”

Section: Introductionmentioning

confidence: 99%

“…There are also asymmetric rectangular bars with different lengths [20] or widths [21], asymmetric dimer disks with different radii [22], and T-shaped [23], tetramer [24], and hexamer nanodisks [25] with different configurations and distributions, which generate quasi-BICs through near-field interactions using interpolymer gaps in the superlattice. There are also different configurations and distributions of asymmetric rectangular bars with different lengths [20] or widths [21], asymmetric dimer disks with different radii [22], and shape-varying T-shaped [23], tetramer [24], and hexamer nanodiscs [25], which generate quasi-BICs by exploiting the nearfield interactions between the polymers in the superlattice. However, it is the presence of internal gaps that increases their precision requirements for fabrication errors, whereas monomers possess greater fabrication tolerances due to the fact that they do not have to take into account inter-cell coupling in the superlattice.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Chen,

Zhao,

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

Bound states in the continuum (BICs) with ultra-high Q properties have attracted much attention for their perfect localization in the continuous spectral range coexisting with extended waves. In this study, breaking the traditional excitation form of structure breakage or excitation field asymmetry, a monomeric silicon nanodisk array with relative displacement generated by the complete splitting of square nanopores is proposed based on the unique electromagnetic properties of all-dielectric metamaterials. During the introduction of perturbations by asymmetric displacements of splitting holes, it is shown by numerical simulations that two BICs at different wavelengths can be realized. Combined with eigenmodes of group theory, the symmetric matching relationship between the symmetry-protected BICs and the free-space radiation during the evolution process is analytically demonstrated, and the formation mechanism and the evolution law of the BICs excited by this metasurface are deeply investigated. meanwhile, it also provides a theoretical basis for the polarization dependence of quasi-BICs excitation and the ultra-high Q factor expression of BICs. Furthermore, near-field distribution and multipole decomposition show that the field distribution and surface currents support the excitation of BIC-driven toroidal dipole and magnetic quadrupole dual modes. This study not only provides an effective reference for the stability of high-Q resonance wavelengths, but also solves the problem of the lack of universality in analyzing the resonance mechanism based on resonance phenomena, and provides solid theoretical support for the study of displacement-mediated BICs resonance excitation and evolution.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Chen,

Zhao,

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…BICs were first predicted by Neumann and Wigner in 1929 [1]. Since then, BICs were found in various fields of physics such as photonics [7,8], acoustics [9][10][11], magnonics [12], mesoscopics [13,14], and plasmonics [15][16][17]. Interest in BICs also results from their potential use in many applications such as lasers [18], filters [19,20], and sensors [21,22].…”

Section: Introductionmentioning

confidence: 99%

Formation and highly directional output of long-lived resonances in photonic comblike structures

Dobrzyński,

Al-Wahsh,

Akjouj

et al. 2023

Phys. Rev. B

View full text Add to dashboard Cite

Bound states in the continuum (BICs) and long-lived resonances have become a unique way to produce the extreme localization of light waves. In this paper, we present a theoretical demonstration of BICs and long-lived resonances in photonic comblike structures with two semi-infinite leads, together with their existence conditions. The comb structure is composed of connected guides of length L. The BICs correspond to localized resonances of infinite lifetime inside the comb, without any leakage into the surrounding leads. When BICs exist within state continua, they induce long-lived resonances for specific values of some modified lengths of the guides constituting the comb structure. This enables to regulate these resonances by means of these lengths. The obtained results take due account of the state number conservation between the final system and the reference one constituted by the independent comb and semi-infinite leads. This conservation rule enables to find all the states of the final system and among them the bound in continuum ones. In addition, we present a comb structure with highly directional outputs through two different lines. In each output line two different long-lived resonances enable to transmit two different signals. This system enables to demultiplex two different signals through each of two output lines. The analytical results are obtained by means of the Green's function technique. The structures and the long-lived resonances presented in this paper may have potential applications due to their high sensitivities to weak perturbations, in particular in filtering, sensing, and communication technology improvements.

show abstract

“…The first proposal of BICs was due to Von Neumann and Wigner in 1929 for quantum systems [2]. To date, BICs represent an ubiquitous phenomenon applying to all domains of wave physics, such as acoustics [3][4][5][6][7][8][9][10], mesoscopics [11,12], photonics [13][14][15], and plasmonics [16][17][18]. There are numerous realizations of BICs in classical systems, leading to a wide variety of different applications such as lasers [19], filters [20,21], demultiplexers [22], and sensors [23,24].…”

Section: Introductionmentioning

confidence: 99%

Friedrich-Wintgen bound states in the continuum and induced resonances in a loop laterally coupled to a waveguide

et al. 2022

View full text Add to dashboard Cite

The concept of bound states in the continuum (BICs) in a simple cavity attracts much interest in recent works in wave physics. The BICs are perfectly confined modes with an infinite lifetime that reside inside the continuous spectrum of radiative modes, but they remain totally decoupled from it. There exist several types of BICs based on their physical origin: one of the most interesting types is Friedrich-Wintgen (FW) BICs which result from the destructive interference of two resonant modes belonging to the same cavity. Here, we investigate theoretically and experimentally the existence of FW BICs in a side-coupled loop. The cavity is made of a loop of length 2d = d 2 + d 3 connected to a stub of length d 4 . The whole cavity is attached vertically to two semi-infinite waveguides by a wire of length d 1 . We demonstrate that the BICs can be induced either by the loop-stub system or by the two arms of lengths d 2 and d 3 of the loop for specific geometrical parameters. When a perturbation in the system produces a deviation from the BIC condition, the latter transforms to either electromagnetically induced transparency (EIT) or reflection (EIR) or Autler-Townes splitting (ATS) resonances. Both EIT and ATS exhibit similar features in the transmission spectrum, namely, a transparency window; however, they have different physical origins. Therefore, EIT and ATS resonances are fitted with corresponding analytical model expressions, revealing good agreements. The Akaike's information criterion is then used to quantitatively discern EIT from ATS and the transition from ATS to EIT is also carried out. Our theoretical results are obtained by means of the Green's function method which enables us to obtain the transmission and reflection coefficients, dispersion relations, as well as density of states and scattering matrix. An experimental validation of all these results is performed in the radio-frequency domain using coaxial cables.

show abstract

Bound States in the Continuum in a T-Shape Nanohole Array Perforated in a Photonic Crystal Slab

Cited by 17 publications

References 45 publications

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Mechanism of formation and evolution of bound states in the continuum of split-hole all-dielectric metasurface under asymmetric displacement perturbation

Formation and highly directional output of long-lived resonances in photonic comblike structures

Friedrich-Wintgen bound states in the continuum and induced resonances in a loop laterally coupled to a waveguide

Contact Info

Product

Resources

About