Strong coupling between excitons in a two-dimensional atomic crystal and quasibound states in the continuum in a two-dimensional all-dielectric asymmetric metasurface

Xie, Peng; Liang, Zhengchen; Jia, Tongtong; Li, Daimin; Chen, Yixuan; Chang, Peijie; Zhang, Hong; Wang, Wei

doi:10.1103/physrevb.104.125446

Cited by 42 publications

(18 citation statements)

References 58 publications

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“…The Q-BIC mode generated by the asymmetric structure means that destroy the metasurface consisting of C 4V symmetric atomic arrays. This symmetry breaking leads to the leakage of previously protected bound states, resulting in the formation of Q-BIC accompanied by radiation losses [18][19][20][21][22]. Yang et al leveraged the asymmetric field distribution in the Q-BIC by purposefully truncating the tips of the constituent elliptical nano-silicon bars to improve the resonance performance of the symmetry-breaking Q-BIC system and enhance the trapping of subwavelength particles [23].…”

Section: Introductionmentioning

confidence: 99%

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Dai,

Liu,

et al. 2023

New J. Phys.

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Bound states in the continuum (BIC) have attracted great attention in nanophotonics in the past few years. The metasurface with inverted symmetry breaking exhibits high Q resonance through quasi-BIC (Q-BIC), which realizes light modulation, sensing and nonlinear generation. In this work, a symmetry-broken Si–VO2 composite metasurface is studied and modulate near-infrared light absorption in Q-BIC mode. First, a L-shaped Si metasurface with broken C4v symmetry is designed, which realizes the transition from BIC to Q-BIC and shows strong circular dichroism. Later, phase-change material VO2 is integrated into the L-shaped Si metasurface. By changing the ambient temperature, the Si–VO2 composite metasurface shows distinct light absorption characteristics, including insensitivity to incident angle and a maximum absorption modulation of up to 210%. The results show that VO2 can effectively modified Q-BIC resonator to realize the modulation absorption of near-infrared light.

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Section: Introductionmentioning

confidence: 99%

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Dai,

Liu,

et al. 2023

New J. Phys.

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“…While most of the milestones of polaritonic physics have been achieved with excitonic materials operating at cryogenic temperatures (≈10 K), recent progress in materials science has promoted many polaritonic demonstrations at room temperature with a wide variety of high bandgap semiconductors, ranging from GaN, [24,25] ZnO, [26] to organic semiconductors, [27,28] and transition metal dichalcogenide monolayers, [29,30] as well as perovskite materials. [31][32][33][34][35][36][37][38][39][40][41] Very recently, the strong coupling regime between photonic BICs and excitonic resonances has been theoretically suggested, [42][43][44][45] with two experimental demonstrations. [46,47] The result of such a coupling is the formation of polariton-BICs (pol-BICs): hybrid excitations that are completely decoupled from the radiative continuum.…”

Section: Introductionmentioning

confidence: 99%

Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface

Dang

Zanotti

Drouard

et al. 2022

Advanced Optical Materials

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mechanical effect, [1] the origin of BICs is nowadays fully unraveled as a particular solution of wave equations, which has led to their exploitation in other fields where it is straightforwardly attributed to destructive interference mechanisms or symmetry mismatches. [2] The most active playground of BIC physics is in contemporary Photonics [3] since most of optoelectronic devices rely on resonances and their coupling mechanisms with environment. Indeed, the trapping of light through photonic BICs is a salient feature to enhance different light-matter interaction mechanisms, leading to various applications in microlasers, [4][5][6][7][8] sensors, [9] optical switches, [7] and nonlinear optics. [10][11][12][13] Moreover, on the fundamental side, photonic BICs in periodic lattices are pinned to singularities of farfield polarization vortex and can be considered as topological charges of nonHermitian systems. [14][15][16][17] This topological nature, together with modern technological feasibility to tailor photonic materials, makes photonic BICs a fruitful platform to engineer polarization singularities of open photonic systems. [5,[18][19][20] Another prominent area of investigation in modern Optics is represented by exciton-polaritons, elementary excitations arising from the strong coupling regime between confined light and semiconductor excitons. [21] As hybridized eigenmodes, these bosonic quasiparticles inherit original features of both Exciton-polaritons are mixed light-matter excitations resulting from the strong coupling regime between an active excitonic material and photonic resonances. Harnessing these hybrid excitations provides a rich playground to explore fascinating fundamental features, as out-of-equilibrium Bose-Einstein condensation and quantum fluids of light, plus novel mechanisms to be exploited in optoelectronic devices. The formation of exciton-polaritons arising from the mixing between hybrid inorganic-organic perovskite excitons and an optical bound state in a continuum (BIC) of a subwavelength-scale metasurface, are experimentally investigated at room temperature. These polaritonic eigenmodes, hereby called polariton BICs (pol-BICs) are revealed in reflectivity, resonant scattering, and photoluminescence measurements. Although pol-BICs only exhibit a finite quality factor bounded by the nonradiative losses of the excitonic component, they fully inherit BIC peculiar features: a full uncoupling from the radiative continuum in the vertical direction, which is associated to a locally vanishing farfield radiation in momentum space. Most importantly, the experimental results confirm that the topological nature of the photonic BIC is perfectly transferred to the pol-BIC. This is evidenced by the observation of a polarization vortex in the farfield of polaritonic emission. The results pave the way to engineer BIC physics of interacting bosons and novel room temperature polaritonic devices.

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“…43 Liang et al designed a periodical silicon-bar-pair array to realize a Rabi splitting of 34 meV. 44 However, the schemes mentioned above are merely used for realizing strong coupling between photonic resonance and exciton in monolayer TMDCs. Owing to the ultrathin nature of a TMDC monolayer, the interactions between TMDC monolayer and light are typically extremely weak.…”

Section: Introductionmentioning

confidence: 99%

Strong coupling of excitons in patterned few-layer WS₂ with guided mode and bound state in the continuum

Qing

2022

Phys. Chem. Chem. Phys.

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Strong coupling between excitons in a two-dimensional atomic crystal and quasibound states in the continuum in a two-dimensional all-dielectric asymmetric metasurface

Cited by 42 publications

References 58 publications

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface

Strong coupling of excitons in patterned few-layer WS₂ with guided mode and bound state in the continuum

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Strong coupling between excitons in a two-dimensional atomic crystal and quasibound states in the continuum in a two-dimensional all-dielectric asymmetric metasurface

Cited by 42 publications

References 58 publications

Absorption modulation of quasi-BIC in Si–VO2 composite metasurface at near-infrared wavelength

Absorption modulation of quasi-BIC in Si–VO2 composite metasurface at near-infrared wavelength

Realization of Polaritonic Topological Charge at Room Temperature Using Polariton Bound States in the Continuum from Perovskite Metasurface

Strong coupling of excitons in patterned few-layer WS2 with guided mode and bound state in the continuum

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Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Strong coupling of excitons in patterned few-layer WS₂ with guided mode and bound state in the continuum