Research On Infrared Radiation Absorption Control Characteristics Of Graphene/Structure

Matter in nature always radiates energy to the outside world.The traditional block structure can only respond to limited energy,and it is difficult to meet the high performance and integration requirements of modern optical technology applications.The massive structure is processed into a micro-nano structure with periodic morphology,which can realize the regulation of specific radiation energy.Micro-nano structure achieved wide application in the fields of optical perfect lenses,band-pass filters,cloaks,slow light structures and electromagnetic black holes.However,the micro-nano structure composed of traditional metal dielectrics can only respond to specific electromagnetic waves after the parameters are fixed,it is difficult to achieve the function of real-time electromagnetic wave regulation.Graphene is technologically compatible with traditional materials and the adjustable Fermi level provides a new breakthrough in solving the above problems.Based on the ability of micro-nano structure to manipulate spectral characteristics and the unique optical characteristics of graphene,this thesis studies their design methods and physical mechanisms for optical regulation.The infrared absorption control characteristics of graphene/structure are studied,and the infrared spectrum control characteristics of excited high absorption are analyzed.The research results provide theoretical guidance for the development and application of new graphene devices.Based on traditional metal and dielectric materials,the narrow-band and wideband optical control characteristics of structure are studied.The Al/Al2O3/Al ring structure and the W/SiO₂ multilayer pyramid structure are designed,which achieve the absorption of a specific spectral narrow band and broadband,and the internal mechanism that causes the enhancement mode is analyzed.The ring structure can excite multiple magnetic polaritons modes to achieve narrow-band perfect absorption,and the multilayer pyramid structure excites slow light effect,moth-eye effect,and local surface plasmon mode to modulate the absorption characteristics of the structure.These design methods build theoretical foundation to design graphene/structure in the next step.The spectral absorption mechanism of graphene/grating structure has been studied.Utilizing the optical properties of graphene which can near-perfect transmission electromagnetic waves in infrared region,a structure model of the enhanced absorption mechanism that excites the magnetic polariton mode is established.The graphene/Au/SiO₂/Au grating structure is designed.After the graphene is transferred,the peak absorption rate of the structure is increased from 0.38 to 0.9.The high absorption geometry parameters are obtained,which using LC loop model and finite element method verify each other.Analyzing the positions of electromagnetic field and the power dissipation density,which jointly evaluate the mechanism of enhanced absorption.The influence of geometric parameters and graphene placement on the absorption rate is explored,and theoretically realize the dynamic control of graphene devices.The single-layer graphene has only atomic layer thickness,which limits practical applications.The h BN anisotropic two-dimensional material is added as the substrate of graphene,which establish a device model of graphene/h BN/Al grating composite structure and achieve the three resonance peaks.The results provide a theoretical basis for the design of novel tunable graphene devices.The infrared optical absorption characteristics of graphene devices are studied.An optimized method for growing and transferring graphene is proposed based on chemical vapor deposition.The Au/SiO₂/Au thin film structure is fabricated by thermal evaporation technology and plasma chemical vapor deposition.The structure with different structural parameters are fabricated by ion beam etching.Graphene is transferred to the surface of the structure to form a graphene/grating structure and a graphene/square ring structure.The absorption characteristics of the two structures in the infrared spectrum are studied by simulation and experiments.The narrow-band bimodal and trimodal high absorption are achieved,and the dynamic control characteristics of graphene devices are discussed.The research methods and experimental results have potential guiding significance for the application of graphene devices.In this thesis,the infrared radiation absorption control characteristics of graphene/structure have been studied.Design and experimental research on the spectral control characteristics of graphene/structure.A complete set of design schemes from theoretical simulation to experimental research has been established,which has important reference for application-specific orientation device design,optical detection and stealth applications.