Dual quasibound states in the continuum in compound grating waveguide structures for large positive and negative Goos-Hänchen shifts with perfect reflection

Wu, Feng; Luo, Ma; Wu, Jiaju; Fan, Caifu; Qi, Xin; Jian, Yiran; Liu, De Jun; Xiao, Shuyuan; Chen, Gengyan; Jiang, Haitao; Sun, Yong; Chen, Hong

doi:10.1103/physreva.104.023518

Cited by 66 publications

(20 citation statements)

References 83 publications

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“…realized dual bound states in the continuum (dual BICs) based on the selective excitations of the forward and backward propagating resonant guided modes, which induces large positive and negative Goos–Hänchen shifts assisted by dual quasi‐BICs. [ 30 ] Wang et al. constructed a two‐port system composed of graphene and silicon nano disks, where the absorption efficiency of graphene was enhanced by changing the structural parameters of the nano disks.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al realized dual bound states in the continuum (dual BICs) based on the selective excitations of the forward and backward propagating resonant guided modes, which induces large positive and negative Goos-Hänchen shifts assisted by dual quasi-BICs. [30] Wang et al constructed a two-port system composed of graphene and silicon nano disks, where the absorption efficiency of graphene was enhanced by changing the structural parameters of the nano disks. [31] Zeng et al used periodically arranged silicon split rings and silicon substrates to support a symmetry-protected BIC, and enhance the interaction between light and graphene integrated with the dielectric metasurface, therefore the absorption of graphene can be enhanced by the quasi-BIC resonance.…”

Section: Introductionmentioning

confidence: 99%

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Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Liu

2023

Annalen der Physik

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Borophene has the unique optical properties of two-dimensional materials and its own anisotropic characteristics. This work proposes a perfect narrow-band absorption structure to enhance the interaction of light with the monolayer borophene inserted into two different dielectric gratings. The structure efficiently improves absorption efficiency based on the quasi-bound states in the continuum (Q-BIC). The absorption characteristics are numerically simulated and theoretically analyzed by using the rigorous coupled-wave analysis (RCWA) method and the finite element method (FEM). The absorption efficiency of the monolayer borophene is high, up to 99.18% with a full-width at half maximum (FWHW) of 0.62 nm, achieving nearly perfect narrow-band absorption. Moreover, the mechanism of enhanced absorption of monolayer borophene is verified by the coupled mode theory (CMT), which indicates that the nearly perfect absorption is also derived from the critical coupling. At the same time, the influence of the thickness and width of the two layer dielectric structure on the absorption efficiency is theoretically analyzed. Furthermore, due to the anisotropic optical properties of the structure for TE and TM polarized light, a narrow-band polarization plate or sensor can be realized. The structure designed provides a new possibility to enhance the interaction between monolayer borophene and light.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Liu

2023

Annalen der Physik

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“…In recent years, its importance has grown due to its sensitivity to changes in optical interface parameters [5][6][7][8]. It affects the modes of optical waveguides and microcavities [9][10][11][12][13], and offers potential for the design of new optical sensors [14,15]. Consequently, understanding the mechanisms underlying GH displacement generation [16][17][18][19][20][21][22][23][24][25][26][27][28] and developing techniques for manipulating GH displacement [29][30][31][32][33][34][35][36] have become significant research pursuits.…”

Section: Introductionmentioning

confidence: 99%

Interference effect on Goos–Hänchen shifts of anisotropic medium interface

Li,

Chen,

et al. 2023

New J. Phys.

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We present a comprehensive analysis of the anomalous Goos–Hänchen (GH) displacement that occurs during the reflection of light beams at an interface between air and an anisotropic medium. This analysis also applies to the Imbert–Fedorov effect. Our study suggests that the anomalous GH displacement is primarily caused by polarization-dependent abnormal interference effects between the direct and cross-reflected light fields. Using the interface between air and a type II Weyl semimetal as an example, we provide a clear physical explanation for the relationship between spin-dependent abnormal interference effects and anomalous GH displacement. We demonstrate that spin-dependent constructive interference leads to a reduction in the GH displacement of the total reflected light field, while spin-dependent destructive interference results in an increase in the GH displacement of the total reflected light field.

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“…In the same year, Azzam et al proposed a metal grating and discussed hybrid plasmonic-photonic systems [14]. In 2019, Wu et al discussed BIC by tuning the distance of gap in grating [15], besides, they had achieved dual quasi-bound states to discussed symmetry analysis in 2021 [16], and they established a hybrid coupling model to discuss coupled-grating system in 2022 [17]. For the discussion on symmetric Field distribution, Yi Xu et al proposed toroidal dipole metasurface and transformed TD-BICs with ultrahigh-Q factors [18], and Y. F. Chen et al Proposed metal-graphene hybrid metasurfaces to discuss BIC in 2022 [19].…”

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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Dual quasibound states in the continuum in compound grating waveguide structures for large positive and negative Goos-Hänchen shifts with perfect reflection

Cited by 66 publications

References 83 publications

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Perfect Narrow‐Band Absorber of Monolayer Borophene in All‐Dielectric Grating Based on Quasi‐Bound State in the Continuum

Interference effect on Goos–Hänchen shifts of anisotropic medium interface

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

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