Fig. 1. Asymmetric resonant microcavity multilayer film structure based on Bragg grating/metal film

Fig. 2. Experimental results of multilayer thin film structure. (a) Normalized electric field intensity; (b) absorption spectra

Fig. 3. Spectra of different metal films. (a) Absorption spectra of graphene; (b) reflection spectra of multilayer thin film structures

Fig. 4. Performance curves of different spacer thickness and overburden thickness. Under different thickness of spacer layer, (a) absorption spectra, (b) normalized electric field intensity distribution; under different thicknesses of cover layer, (c) absorption spectra, (d) normalized electric field intensity distribution

Fig. 5. Results of optimizing thicknesses of cover layer and spacer layer. (a) Relationship between absorption rate of graphene at 275 nm and theicknesses of cover layer and spacer layer; (b) absorption and reflection spectra of optimized multilayer thin film structure

Fig. 6. Effect of central wavelength of Bragg grating on absorption characteristics of graphene. (a) Absorption spectra; (b) peak wavelength and absorption peak

Fig. 7. Influence of light incident angle and polarization on absorption properties of graphene. (a) Absorption peak; (b) peak wavelength

Fig. 8. Relationship between absorption peak and FWHM of graphene and number of graphene layers

Fig. 9. Absorption and reflection spectra of multilayer structure with monolayer MoS₂