Enduo Gao, Rong Jin, Zhenchu Fu, Guangtao Cao, Yan Deng, Jian Chen, Guanhai Li, Xiaoshuang Chen, Hongjian Li, "Ultrawide dynamic modulation of perfect absorption with a Friedrich–Wintgen BIC," Photonics Res. 11, 456 (2023)

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- Photonics Research
- Vol. 11, Issue 3, 456 (2023)

Fig. 1. (a) 3D schematic diagram composed of graphene gratings and graphene sheets; (b) 2D side view of the proposed system; the specific parameters are as follows: P = 490 nm , w = 400 nm , h 1 = 12 nm , h 2 = 1350 nm , h 3 = 100 nm , E f ′ = E f = 1.0 eV .

Fig. 2. (a) Absorption spectra of the proposed system; (b)–(f) electric field distribution of different modes in the y direction.

Fig. 3. BIC formation in the hybrid FPR–GMR system. (a) Absorption spectrum as a function of the width of the graphene grating; (b) cross sections of the absorption spectra at w = 168 nm and 144 nm show the appearance of the collapsed F–W BIC to quasi-BIC. (c) Avoided crossing and linewidth vanishing due to the coupling of FPR and GMR modes at different w .

Fig. 4. (a) Schematic diagram of CMT; (b) coupled absorption spectra of FDTD numerical simulation and CMT fitting at w = 400 nm .

Fig. 5. (a) Band structures of the proposed FPR–GMR hybrid system. Here, the illustration shows electric field distribution at F-W BIC. (b) Simulated Q -factor evolution for the GMR band.

Fig. 6. (a) F–W BIC dynamically modulated by the Fermi energy level of a graphene grating (w = 144 nm ); (b)–(e) field distribution of the two modes in the y direction when E f ′ = 1.0 eV and 0.3 eV; (f) perfect absorption frequency modulator and optical switch based on F–W BIC.
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Table 1. Comparisons among Perfect Absorbers

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