Enhanced Strong Coupling of TMDC Monolayers by Bound State in the Continuum

Al-Ani, Ibrahim; As’ham, Khalil; Huang, Lujun; Miroshnichenko, Andrey E.; Hattori, Haroldo T.

doi:10.1002/lpor.202100240

Cited by 96 publications

(29 citation statements)

References 40 publications

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“…By physically varying the spacing of the RDG, the modes at the edge of the first Brillouin zone now lie at the gamma point (the center of the first Brillouin zone), thus resulting in an artificial BIC caused by the Brillouin folding phenomenon [ 45 ]. Such BIC is dominated by the electric toroidal dipole rather than the SP-BIC dominated by the magnetic dipole [ 46 ]. As a result, instead of having to break the symmetry of the structure, as in the case of SP-BIC, a simple change in the grating spacing can transform the BIC into a QBIC, leading to high- Q resonance.…”

Section: Resultsmentioning

confidence: 99%

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

Shi¹,

Hu²,

Liu³

et al. 2022

Beilstein J. Nanotechnol.

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Herein, we theoretically demonstrate that a double-layer symmetric gratings (DLSG) resonator consisting of a low-refractive-index layer sandwiched between two high-contrast gratings (HCG) layers, can host dual-band high-quality (Q) factor resonance. We find that the artificial bound states in the continuum (BIC) and Fabry–Pérot BIC (FP-BIC) can be induced by optimizing structural parameters of DLSG. Interestingly, the artificial BIC is governed by the spacing between the two rectangular dielectric gratings, while the FP-BIC is achieved by controlling the cavity length of the structure. Further, the two types of BIC can be converted into quasi-BIC (QBIC) by either changing the spacing between adjacent gratings or changing the distance between the upper and lower gratings. The simulation results show that the dual-band high-performance sensor is achieved with the highest sensitivity of 453 nm/RIU and a maximum figure of merit (FOM) of 9808. Such dual-band high-Q resonator is expected to have promising applications in multi-wavelength sensing and nonlinear optics.

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Section: Resultsmentioning

confidence: 99%

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

Shi¹,

Hu²,

Liu³

et al. 2022

Beilstein J. Nanotechnol.

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“…Recently, researches proposed symmetrical structures to discuss BIC with photonic crystals and metasurfaces [4][5][6][7][8][9][10][11]. Grating as a high-performance structure is researched in many fields, and it is suitable as a highly symmetrical structure for the study of BIC.…”

Section: Introductionmentioning

confidence: 99%

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Ruan

Wang

et al. 2022

IEEE Photonics J.

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In the field of optics, bound state in the continuum (BIC) as a special state to be researched in many photonic crystals and periodic structures, which can produce strong resonance and an ultrahigh Q factor. Some designs of narrowband transmission filters, lasers, and sensors are proposed based on excellent optical properties of quasi-BIC. In this paper, we consider symmetrical rectangular grating structure firstly. Then cut off a corner of rectangular gratings, the Fano line of quasi-BIC can be observed in the spectrum. After that, we change the oblique parameter of the other rectangular grating, which can further decrease the Fano line width. In the momentum space, the change of structure means topological charges split from q=1 into half charges q=1/2. We analyze guided mode resonance (GMR) excitation of the grating structure, and discuss the dispersion relations in the waveguide layer with the position of BIC in energy bands. In addition, the spectrum exhibits asymmetric line-shapes with different values of the asymmetry parameters, M1 and M2. BIC is transformed into quasi-BIC as the symmetry of the structure broken. Thus, a large Goos-Hänchen shift can be achieved as a result of ultrahigh Q factor of quasi-BIC. This work demonstrates a double trapezoid structure with strong resonance properties, which has significant implications for exploring the phenomenon of BIC.

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“…Introducing structural perturbation could open the radiation channel and transform an ideal BIC into its quasi-state with a controllable Q factor. For symmetry-protected BICs in metasurfaces, engineering the reflection symmetry (RS) [3,8,9] or translational symmetry (TS) [10][11][12][13] of a unit cell is key to constructing high-Q quasi-BIC resonances, which have been widely exploited in nonlinear harmonic generations [14,15], nanolasers [16,17], sensitivityenhanced sensing [18,19], optical modulator [20] and light-matter interactions [21,22].…”

Section: Introductionmentioning

confidence: 99%

Q-factor mediated quasi-BIC resonances coupling in asymmetric dimer lattices

Gao¹,

Xu²,

Shen³

2022

Opt. Express

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Resonance coupling in the regime of bound states in the continuum (BICs) provides an efficient method for engineering nanostructure's optical response with various lineshape while maintaining an ultra-narrow linewidth feature, where the quality factor of resonances plays a crucial role. Independent manipulation of the Q factors of BIC resonances enables full control of interaction behavior as well as both near-and far-field light engineering. In this paper, we harness reflection symmetry (RS) and translational symmetry (TS) protected BIC resonances supported in an asymmetric dimer lattice and investigate Q-factor-mediated resonance coupling behavior under controlled TS and RS perturbations. We focus on in-plane electrical dipole BIC (EDi-BIC) and magnetic dipole BIC (MD-BIC) which are protected by RS, and out-of-plane electrical dipole BIC (EDo-BIC) protected by TS. The coupling between EDi-BIC and EDo-BIC exhibits a resonance crossing behavior where the transmission spectrum at the crossing could be tuned flexibly, showing an electromagnetically induced transparency lineshape or satisfying the lattice Kerker condition with pure phase modulation capability depending on TS and RS perturbed Q factors. While the coupling between MD-BIC and EDo-BIC shows an avoided resonance crossing behavior, where the strongly coupled resonances would lead to the formation of a Friedrich-Wintgen BICs whose spectral position could also be shifted by tuning the Q factors. Our results suggest an intriguing platform to explore BIC resonance interactions with independent Q factor manipulation capability for realizing multifunctional meta-devices.

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Enhanced Strong Coupling of TMDC Monolayers by Bound State in the Continuum

Cited by 96 publications

References 40 publications

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Q-factor mediated quasi-BIC resonances coupling in asymmetric dimer lattices

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