Research On Absorber Based On Molybdenum Disulfide And Its Analysis Method

With the development of photoelectric technology,visible-light absorber has been widely used in energy storage,sensing,imaging,and so on.Based on the absorption characteristics of graphene-like molybdenum disulfide(MoS2)in the visible-light band,two kinds of absorbers operating in visible-light band are proposed in the dissertation.Then,the method that is suitable for the analysis of the absorber is studied and the physical mechanism of the proposed absorber is revealed.The main research contents are as follows:Firstly,the complex dielectric constant of monolayer MoS2 is calculated and analyzed according to the Lorentz-Drude-Gaussian hybrid model.Furthermore,the transmission characteristics and the absorption characteristics of monolayer MoS2 in the visible range are investigated,which builds a foundation for the research of layered structure absorber involving MoS2 and the analysis method.Secondly,a resonant perfect absorber is designed on the basis of the magnetic coupling effect between monolayer MoS2 and nano-silver.The absorber comprises a nano-silver periodic unit-monolayer MoS2-silica-reflector with an absorption rate≥90%in the wavelength range of 729-767nm and the relative bandwidth of 5%.Besides,the absorption rate reaches 99.98%at λ = 749 nm,which shows that the resonant perfect absorber is realized.Thirdly,in the visible-light band,a broadband absorber with layered structure was designed on the basis of the absorption characteristics of monolayer MoS2.The absorber is composed of the sandwich structure with the monolayer MoS2 and the medium with a dielectric constant of 3ε0.When the layer number of the sandwich structure is five layers,the optimal absorption performance is obtained,i.e.,the absorption rate is 90%in the wavelength range of 391-513nm and the relative absorption bandwidth is 27%;moreover,the proposed design is polarization insensitive.Finally,the continued fraction method and the generalized destructive interference method are proposed and investigated.Based on the methods,the absorbing properties of the MoS2-based absorbers are analyzed for various incident angles and polarized incident waves.In addition,the physical mechanism of the proposed MoS2-based absorber is revealed by using the generalized destructive interference method.The reliability of the proposed methods is validated by use of CST Microwave Studio 2016.