Fig. 1. Schematic diagram of the multilayer structure consisting of two different Bragg mirrors and a monolayer MoS₂ sandwiched in the Bragg mirrors. The thicknesses of Si₃N₄ and SiO₂ layers are denoted by a_l and b_l (a_r and b_r) for the left (right) Bragg mirror, respectively. The period numbers of the left and right Bragg mirrors are P_l and P_r, respectively. The light is incident from the left side of the structure.

Fig. 2. (a) Reflection spectra in the multilayer structure with P_l = 8, P_r = 20, a_l = 89 nm, b_l = 44 nm, a_r = 148 nm, b_r = 130 nm, and θ = 0°. (b) Light absorption spectra of the multilayer structure with a MoS₂ monolayer. The lines and circles represent theoretical and simulation results, respectively. The upper inset shows the field distribution of |E|² at the wavelength of 509.5 nm in the multilayer structure (h = 0 nm). The lower inset shows the spectrum of MoS₂ light absorption in the full visible range.

Fig. 3. (a) Evolution of MoS₂ light absorption spectrum with the Si₃N₄ layer thickness a_l in the structure with a_r = 148 nm and θ = 0°. (b) Corresponding absorption spectrum of MoS₂ monolayer when a_l = 82 nm and θ = 0°. The inset shows the dependence of electric field intensity in MoS₂ on a_l. (c) Evolution of MoS₂ light absorption spectrum with the thickness a_r when a_l = 82 nm and θ = 0°. (d) Evolution of MoS₂ light absorption spectrum with θ when a_l = 82 nm and a_r = 149 nm. The circles denote the simulation results. Here, P_l = 8, P_r = 20, b_l = 44 nm, and b_r = 130 nm.

Fig. 4. (a) Light absorption spectra of MoS₂ monolayer in the multilayer structure with different period numbers P_l when P_r = 20. (b) Absorption peak values of MoS₂ as a function of P_l, and the wavelengths of MoS₂ absorption peak and OTS as a function of P_l. (c) Absorption spectra of MoS₂ obtained by the TMM calculation (dots) and fitting (line) when P_l = 9. The inset shows the TCMT model of OTS in the structure. (d) Fitting parameters γ₁, γ₂, and γ₃ versus P_l. (e) Absorption spectra of MoS₂ in the structure with different P_r when P_l = 9. The inset shows the absorption spectra around the peaks. (f) Fitting parameters γ₁, γ₂, and γ₃ versus P_r. Here, a_l = 82 nm, b_l = 44 nm, a_r = 149 nm, b_r = 130 nm, and θ = 0°.