Preparation Of Photonic Crystals And Study Of Its Hybrid Structure With Molybdenum Disulfide

With the rapid development of the wearable ultra-thin high-resolution display industry,next generation of ultra-thin dynamic light-emitting devices have attracted extensive attention.Two-dimensional materials revolutionize optoelectronics.As a typical representative of two-dimensional materials,single-layer molybdenum disulfide enables widespread applications due to its superior optical,electrical,mechanical properties,as well as high-mobility carrier.However,the ultralow luminescent efficiency of the single-layer molybdenum disulfide impedes its direct application in industrial products.Photonic crystals are periodically ordered micro-or nanostructures that are arranged in 2D or 3D space with alternatively changed dielectric constants,leading to photonic bandgaps that prevent specific frequencies of electromagnetic waves propagating within the photonic crystals.This unique property makes photonic crystals wide applications in many areas.Therefore,we employ a photonic crystals with tunable bandgap to dynamically manipulate the luminescence of single-layer molybdenum disulfide.We firstly build a simulationmodel to calculate the bandgap of photonic crystals and determine the key parameters and the configurations of the microspheres.Vertical deposition method has been used to produce the photonic crystals.The influence of temperature and the volume fraction of silica microspheres on the quality of the photonic crystals is detailed analyzed.Secondly,polyethylene glycol(600)diacrylate(PEGDA)was selected to fill the cavities within the photonic crystal,and then the silicon dioxide microspheres were etched by using hydrofluoric acid,followed by N₂ blowing to obtain the inverse opal structure photonic crystals.Monolayer molybdenum disulfide,prepared by the chemical vapor deposition method,is transferred onto the surface of the inverse opal photonic crystal with the help of wet transferring method.Interactions between the photons and the molybdenum disulfide excitons localized on the surface of the photonic crystal is ascribed to the strong photon-exciton coupling,which in turn enhances the photoluminescence emission of the monolayer molybdenum disulfide.FDTD simulation is used to calculate the far-field and near-field spectral characteristics of the hybrid structure consisting of photonic crystal and molybdenum disulfide,which furtherly corroborate the accuracy of the experiment and determine the coupling mode of the hybrid structure.Strong coupling and Rabbi split have been observed.In addition,the reflection spectrum and electric field of the hybrid structure of inverse opal photonic crystal and molybdenum disulfide with different stretching ratios were calculated.The hybrid structure obtained can be applied to strong coupling optical matter system and low-threshold microcavity laser.Light-emitting devices provide a theoretical basis and broaden the application fields of this thesis.