Research And Application Of Metamaterials In The Modulation Of Optical Field Amplitude

The metamaterial is a kind of artificial material,its optical properties depend on its geometry structure,and can obtain the optical properties that natural materials do not have.The abundant physical properties of the metamaterials can realize flexible control of the multi dimensions of the light with the subwavelength scales.Therefore,it has a great application prospects in the fields of optics and information science,biosensor technology,microwave and terahertz devices,life science and medicine,and has become a hot research topic in nano photonics.In this paper,the amplitude regulation of light based on the metamaterial is studied.The plasmonic induced transparency metamaterials,the perfect absorbers and the dynamic tunable metamaterials are designed.The finite element method is used to simulate and analyze the designed metamaterial.Then,the effect of light modulation,the physical mechanism and applications are further studied.The main contents of the paper are as follow:1.The research significance and application prospect of the modulation of light with the metamaterials are introduced.The development process and theoretical model of the plasmonic induced transparency metamaterials and perfect absorbers are introduced.Finally,the research background of dynamic tunable metamaterials is introduced.The principle of the metamaterial is analyzed by formula derivation and electric field distribution.The influence of geometric parameters on the transmission peak of the metamaterial is discussed.The theoretical results provide a new method for the construction of plasmonic induced transparency metamaterials.2.The paper designs a perfect absorber based on multi resonance.By drawing the distribution of electromagnetic field and deriving the relationship between resonance wavelength and the geometric structure of metamaterial,the physical mechanisms of the broadband perfect absorption is analyzed.The influence of polarization and incidence angle on the absorption is studied.3.A THz broadband absorber based on graphene metamaterial is designed,which can realize the dynamic regulation of absorption strength.The influence of the period and the size of graphene pattern on the absorption is analyzed through the distribution of electric field and the change of absorption with geometric parameters.4.A coherent perfect absorber composed of metal disk and medium is designed.The absorber can adjust the absorption and transmission all-optically by changing the phase difference of incident lights.The physical mechanism of absorption regulation is analyzed by scattering matrix theory and electric field distribution diagram.The influence of dielectric constant and geometry parameters on absorption wavelength is analyzed,and the application of the absorber in communication field is extended.The above researches based on the amplitude modulation of light provides instructive ideas for the design of multi-band and multifunctional metamaterials of selected through and perfectly absorbed.In addition,the properties of the materials designed in this paper make the above works have potential applications in optics,energy,telecommunication,and other fields.