Research On Emission And Transmission Of Crown-shaped Rare Earth-doped Up-conversion Waveguide

Optical waveguide is a dielectric waveguide that use the principle of total reflection to guide the transmission of light.Due to its high transmission rate,large capacity,low loss and strong anti-interference ability,it has brought earth-shaking changes to the field of communication.Micro-nano-waveguide can restrict light into a very small micro-cavity and form a highly localized optical field,in recent years,with the development of micro-nano technology,the integration of optical waveguide devices on chips becomes possible.The importance of high-quality photonic devices in integrated photonics is self-evident,the excited light of optical waveguide devices based on organic molecules and semiconductors are all located in the ultraviolet region,the further development and application of optical waveguides are limited by the disadvantages of low transmission performance,weak biological penetration and poor material stability.Rare earth doped luminescence materials have nice luminescence properties,such as sharp spectral lines,rich spectral bands and long life.Moreover,the excitation source in the near infrared band is expected to solve the problems of traditional optical waveguide materials.Compared with one-dimensional waveguide,the waveguide with three-dimensional structure has more adjustable excitation and emission modes,it is beneficial to the further study and analysis of waveguide effect.This paper will carry out the research of rare earth doped luminescence three-dimensional waveguide,the main research content is as follows:(1)Crown-like NaYF4:Yb3+/Er3+ microparticles was synthesized by hydrothermal method,the characteristics of space emission are studied under the excitation of near-infrared laser,By using the Fourier imaging system established under the confocal microscopy system,we can obtain the Fourier image of angular space emission,through the analysis of the Fourier image,we can obtain the spatial emission Angle of the fluorescence signal in the three-dimensional space and determine the orientation of its fluorescence emission,by changing the excitation mode,the diversity of angular ermission mode is studied.(2)On the basis of the above research,we systematically analyzed the influence of waveguide effect on the formation of fluorescence emission image by geometric optical simulation.We found that the penetration depth of the excitation light source and the focus position,would affect the waveguide mode,the specific fluorescence waveguide transmission mode is obtained by simulation,finally,the simulation results of fluorescence emission and Fourier image are compared with the experimental results to deepen the understanding of rare earth up-conversion fluorescence emission in micro-nano waveguide.