Study On The Microcavity Waveguide Integrated Devices Based On The Lead Bromide Perovskite

In recent years,organic and inorganic perovskite has attracted a lot of attention due to its strong carrier mobility,low defect density and great optical characteristics.At present,it has been widely used in the production of micro devices such as LED,solar cell,photoelectric detector and laser,and has achieved a lot of progress.However,the research on these optoelectronic devices is relatively independent and there is still a large gap in the research on the field of integrated chip.In addition,in terms of microcavity with whisper gallery mode,and the realization of the emergence of single direction is always a hot topic.In the published results,the deformation of cavity defects,directly coupled microcavity,the introduction of scattering method have been sufficient research,however,these methods are also often accompanied by sacrifice a lot to the micro cavity quality factor and there are still other emergent direction.Based on these factors,in theory,simulation and experiments,this paper is on the preparation of the active sheet perovskite microcavity waveguide coupler parts,the first time to prove the possibility of perovskite piece polishing network,and by introducing external chiral structure,to achieve the single direction of the shot on a device.In order to realize the on-chip integration,this paper uses the two-dimensional whisper gallery mode perovskite microcavity structure as the light source of the coupler.A Comsol simulation model based on finite element algorithm is established to prove the feasibility of this integration scheme.In addition,by comparing the different coupling interval,microcavity size,structure and other factors on the coupling efficiency and single direction emergent properties,the influence of the introduction of chiral helical microcavity structure,choose a better scheme design of experiments.According to this design scheme,the organic inorganic perovskite single crystal with uniform surface area was prepared by the improved one-step solution method,and then the thickness and crystal direction were tested.The spiral cavities,microplates and bus waveguides of organic and inorganic perovskite with different sizes were prepared by a well controlled top-down electron beam lithography and plasma etching process.In order to characterize the optical properties of the device,a femtosecond laser pump sample was adopted to measure the laser mode and properties of the structure.The laser that produces the echo wall mode can be clearly seen from the spectrum.In the experiment,the experimental phenomena of green light on both ends of waveguide proved that the coupling structure of light and waveguide could work.Pump on the basis of the original microcavity waveguide coupling structure addchiral structure device,single-ended observed waveguide is light,should be detectable echo wall pattern spectrum,thus proving has realized the single direction exit.The successful preparation of this single directional jet coupler provides a strong proof for the application of perovskite in the field of photointegration,and proposed a new feasible scheme for the realization of the single direction of microcavity in two-dimensional plane.