Study On The Luminescence Characteristics Of Rare Earth Doped Microtubes Based On Near-field Excitation Of Surface Plasmons

Rare earth elements have rich energy levels and unique electronic structures,so that rare earth doped luminescent materials have the characteristics of sharp emission line,wide range,long life,and superior up-conversion luminescence performance.With the help of rare earth up-conversion light-emitting waveguides,through the regulation of fluorescence transmission and directional emission,the light emission of special structure light field can be realized,which has potential applications in the fields of imaging,microscopic inspection,laser processing and optical communication.In this paper,we use on-chip surface plasmon polariton,and with the help of the multi-mode plasmon interaction to form a moire-shaped near-field distribution,to achieve upconversion luminescence of rare earth Micron tube’s near-field excitation develops an up-conversion periodic luminescence method with simple operation,periodic stability and strong nullability.The main research contents of this paper include:1.Hydrothermal method to synthesize NaYF₄:Yb³⁺/Er³⁺ micrometer tube,wet microchemical method to synthesize micrometer silver triangle chip,and then use micromanipulator to combine micrometer tube and silver chip to construct metal plasmon remotely excited rare earth doping Experimental System of Microtube Luminescence.The experiment combined with the finite element algorithm to study the phenomenon that the plasmon near-field excites rare-earth doped microtubes to produce periodic luminescence.The study found that under laser excitation,the plasmons on the upper and lower surfaces of the silver plate edge will interact to form a beat frequency and be emitted by the edge.At the same time,it interferes with the reflected plasmon to form a stable Moire-shaped near-field distribution.The field is excited to achieve periodic light emission.2.Based on the above experiments,the excitation position and polarization direction of the excitation light were changed,and the related regulation of the periodic emission of the rare earth-doped microtubes was studied.The research results show that the change of the position of the excitation light will produce different modes of plasmon distribution on the surface of the silver sheet,forming different coupling angles with rare earth microtubes,causing them to produce different modes of luminescence.Changing the polarization direction of the excitation light will effectively control the luminous intensity of the rare earth micro tubes.Finally,the experimental results are verified with simulation.