Enhancing light absorption of graphene with dual quasi bound states in the continuum resonances

Cai, Yuepei; Liu, Xiaochuan; Zhu, Keyong; Wu, Huihai; Huang, Yong

doi:10.1016/j.jqsrt.2022.108150

Cited by 16 publications

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“…[ 24 ] Slightly breaking the geometric symmetry which realizing the change of the Q factor, makes the BIC become quasi‐bound state in the continuum (quasi‐BIC). The quasi‐BIC has been shown to be an effective method to strengthen the interaction between light and substance, such as strengthening the Goos–Hänchen shift, [ 25 ] ultrahigh Q‐guided resonance, [ 26 ] strong terahertz magneto‐optical phenomena, [ 27 ] enhanced graphene absorption, [ 28 ] enhanced second‐harmonic generation by moiré quasi‐BIC [ 29 ] , and more. More interesting is enhancing absorption efficiency of 2D materials by using Q‐BIC.…”

Section: Introductionmentioning

confidence: 99%

“…[33] Cai et al achieved the quasi-BIC state by tuning the periodically arranged amorphous silicon nano cube quaternions to cause symmetry breaking, thus, it ultimately enhances the light absorption efficiency of the hybrid structure. [28] It can be seen from the above that the current methods for enhancing the absorption efficiency of borophene are mainly based on the critical coupling [19] and strong coupling mechanisms, [20] and the continuum BIC is currently mainly used in the isotropic 2D material such as graphene. It is interesting to investigate the absorption efficiency of anisotropic borophene basing on Q-BIC.…”

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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