Photosensitive chalcogenide metasurfaces supporting bound states in the continuum

Mikheeva, Elena; Koshelev, Kirill; Choi, Duk‐Yong; Kruk, Sergey; Lumeau, Julien; Abdeddaïm, Redha; Voznyuk, I.; Enoch, Stefan; Kivshar, Yuri S.

doi:10.1364/oe.27.033847

Cited by 47 publications

(29 citation statements)

References 29 publications

(38 reference statements)

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“…As an example, we consider all-dielectric metasurfaces with the in-plane symmetry breaking [89] that can support sharp high-Q resonances arising from a distortion of symmetryprotected BICs. We follow the recent paper [90], we consider a metasurface made of As 2 S 3 and placed on a glass substrate consisting of a square lattice of meta-atoms with broken in-plane inversion symmetry, as illustrated in Figure 5(a). The meta-atom is constructed of a pair of rectangular bars which have lengths L and L − δL, respectively.…”

Section: Bound States In the Continuummentioning

confidence: 99%

All-dielectric Mie-resonant metaphotonics

Bonod¹,

Kivshar²

2020

Comptes Rendus. Physique

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All-dielectric subwavelength structures made of high-refractive-index materials combine a unique set of advantages in comparison with their plasmonic counterparts. In particular, they can interact resonantly with light through the excitation of both electric and magnetic multipolar Mie-type resonances. This review discusses novel approaches to manipulate light with Mie-resonant dielectric subwavelength structures, spanning from individual nanoparticles to metasurfaces, and covering a broad range of effects, from nearfield energy enhancement to far-field beam shaping. Résumé. Les matériaux diélectriques à indice de réfraction élevé peuvent interagir de manière résonnante avec la lumière grâce à l'excitation de modes de Mie électriques et magnétiques. Cette revue présente un état de l'art du contrôle de la lumière par les résonances électriques et magnétiques de Mie dans les nanostructures diélectriques. Elle décrit tout d'abord la reproduction des conditions de Kerker pour un contrôle de la diffusion avant ou arrière de la lumière. Elle décrit ensuite l'intérêt des résonances de Mie pour (i) le contrôle de l'interaction entre la lumière et la matière dans les antennes optiques diélectriques (exaltation de champ proche, densité d'états et directivité d'émission), (ii) la génération d'états photoniques liés dans le continuum ou encore (iii) la génération de couleurs structurelles par des métasurfaces diélectriques.

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Section: Bound States In the Continuummentioning

confidence: 99%

All-dielectric Mie-resonant metaphotonics

Bonod¹,

Kivshar²

2020

Comptes Rendus. Physique

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“…[ 187 ] In addition, an experimental demonstration of a BIC‐based metasurface made of a photosensitive chalcogenide glass has shown tunability of its resonance position. [ 188 ] While the change presented in ref. [ 188 ] was irreversible, that approach may offer a promising direction for dynamic nanophotonic devices that could enable sensors, modulators, and tunable light sources.…”

Section: Tunability and Dynamic Control Of Bicsmentioning

confidence: 99%

“…[ 188 ] While the change presented in ref. [ 188 ] was irreversible, that approach may offer a promising direction for dynamic nanophotonic devices that could enable sensors, modulators, and tunable light sources.…”

Section: Tunability and Dynamic Control Of Bicsmentioning

confidence: 99%

Photonic Bound States in the Continuum: From Basics to Applications

Azzam

Kildishev

2020

Advanced Optical Materials

287

135

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In theory, BICs are dark states with infinite radiative lifetime and generally require at least one dimension of the structure extending to infinity. [6] Similar conditions can also be obtained in localized systems of finite extent when the permittivity approaches zero. [5,11] However, in practice, due to the finite extent of structures, material absorption, and other external perturbations, BICs collapse to a Fano resonance with a limited radiative Q factor. Such resonances are known as quasi-BIC and they have been used to obtain very high Q resonances in numerous photonic systems to date. [6,8,12] Even though practical implementations of BICs are limited to quasi-BIC, in the literature, as well as in this review, quasi-BIC are commonly referred to as BICs. Another type of high-Q resonances called near-BIC is obtained in the vicinity of the BIC through detuning the system from the BIC regime. [9,13,14] Near-BICs can be explained by the Theory of Resonance Reactions by Fonda [13,14] as a bound state can exist in the continuum at an energy where some channels are open even when the open and closed channels are strongly coupled. If the Hamiltonian of the system differs slightly from the one that can produce such a bound state, a sharp resonance appears in all scattering and reaction cross-sections. Near-BIC resonances can be obtained over an interval of values of a specific parameter of the system, unlike BICs that are generally achieved at a single value of the parameter. [9,15] This is of importance for practical systems as it provides stability to fabrication errors and other imperfections. [12] It is also worth mentioning that the total Q factor (Q t) realizable through BICs is generally limited by the material loss. While the radiative Q-factor (Q r) at BICs can diverge, the non-radiative Q-factor (Q nr) is limited by material absorption and its inhomogeneous broadening, scattering from the structural disorder, and in-plane lateral leakage. It is therefore, important to have an accurate distinction between Q r and Q nr and account for non-radiative processes as generally the main contributors to the total Q." 1.2. BIC Types and Formation Mechanisms Since the time of initial prediction of BICs in photonics, they have been realized in numerous geometrical systems, including gratings, waveguides, metasurfaces, and photonic crystals. [4,7,9,16-24] Such a broad diversity of photonic systems supports different types of BICs that originate from various physical mechanisms. We will briefly highlight the different The introduction of bound states in the continuum (BICs) to photonics has revolutionized the way cavity design and light-matter interactions are thought about in general. BICs can have very high quality factors, even in open structures where access to radiation is permissible. Now, BICs found applications in a large class of areas, including nonlinear enhancement, coherent light generation, sensors, filters, integrated circuits, and many others. In this review, the different types of BICs in photonic systems,...

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“…The type II and type III designs are general asymmetry designs that have been used in the references. [ 16,25,60–62 ] The resonant wavelength shift in the type II and III designs is larger than that in the type I due to the large variation in the SCSs of the type II and III designs when the asymmetry parameters are changed (Figure 2b). The SCS is the scattering cross‐section of the structure that is influenced by the filling factor of each primitive unit cell.…”

Section: Design and Simulationmentioning

confidence: 99%

“…The applications of BICs in many fields, especially topological photonics, have been widely discussed. [ 12,17,18 ] By using a topological design to create BICs, different types of metasurfaces or photonic crystals can be used in various applications, such as photonic integrated circuits, [ 19–22 ] sensors, [ 23–25 ] nonlinear effect enhancement, [ 26–30 ] low‐threshold lasers, [ 31,32 ] and vortex lasers. [ 33–36 ] Optical BICs have attracted attention not only as resonators for lasing but also as sources of thermal emission.…”

Section: Introductionmentioning

confidence: 99%

Low‐Threshold Bound State in the Continuum Lasers in Hybrid Lattice Resonance Metasurfaces

Yang

Huang

Максимов

et al. 2021

Laser & Photonics Reviews

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Bound states in the continuum (BICs) have attracted considerable research attention due to their infinite quality factor (Q‐factor) and extremely localized fields, which drastically enhances light–matter interactions and yields high potential in topological photonics and quantum optics. In this study, the room temperature directional lasing normal to a BIC metasurface is demonstrated with hybrid surface lattice resonances. Compared to the plasmonic nanolasers, the BIC metasurface lasers possess directional radiation and a larger emission volume. The high Q‐factor resonance of BIC metasurface overcomes the limitation of a large mode volume in achieving low‐threshold lasing. In addition, a design rule is proposed to prevent the occurrence of wavelength shift when the Q‐factor changes; thus, the lasing thresholds for different BIC metasurfaces can be compared. In this work, the high localization ability of BICs is used to achieve the low lasing threshold (1.25 nJ) at the room temperature. The “light in–light out” diagram of the aforementioned laser based on simulations and experiments exhibits a large spontaneous emission coupling factor (β = 0.9) and the S‐curve. The device developed in this study can be used in various applications, such as quantum emitters, optical sensing, nonlinear optics, and topological states engineering.

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Photosensitive chalcogenide metasurfaces supporting bound states in the continuum

Cited by 47 publications

References 29 publications

All-dielectric Mie-resonant metaphotonics

All-dielectric Mie-resonant metaphotonics

Photonic Bound States in the Continuum: From Basics to Applications

Low‐Threshold Bound State in the Continuum Lasers in Hybrid Lattice Resonance Metasurfaces

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