Research On Fluorescence Directed Radiation Of Quantum Dots Based On Rigorous Coupled-wave

Quantum dots(QDs)are multi-atomic quasi-zero-dimensional nanosystems with good optical absorption,optical radiation,and high quantum yield.Compared with the traditional non-directional radiation,the quantum dot fluorescent directional radiation can improve the optical coupling efficiency of the nano-photoelectric conversion device,increase the fluorescence collection rate,facilitate device integration,and is widely used in biomarkers,photodetectors and other fields.In this paper,a metal diffraction grating is used to make use of the restriction and interference effect of electromagnetic wave and the unique properties of the plasma produced by the metal surface.The way of controlling the fluorescence directional radiation of the quantum dots is studied by the rigorous coupled wave analysis method,and the polarization of the grating parameters,the metal material and the incident light is analyzed,the enhancement of fluorescence and the influence of radiation orientation.The main research work and research results include:1.Based on the rigorous coupled-wave theory,Maxwell's equations are strictly solved in the grating region,and the reflection and diffraction efficiency inside the physical model are analyzed.The results show that the diffraction efficiency of the quantum dots is related to the period,width,depth of the grooves,and the refractive index of the dielectric material.2.Using simulation software,a one-dimensional periodic metal grating physical model was constructed.Using a metal material of Au,a grating period d of 340 nm,a groove depth of 85 nm,and a grating width of 170 nm as parameters of the grating,the near-field radiation intensity of the quantum dot can be enhanced at an incident wavelength ? of 441 nm.And when the incident angle is 84°,the directional radiation of the quantum dots fluorescence is achieved.3.The effects of grating structure parameters,metal materials and two kinds of polarized incident light(TE wave and TM wave)on the diffraction efficiency,near-field radiation energy and far-field directionality of the grating were analyzed.The innovative point of this article is that based on the theoretical analysis,a metal grating structure is proposed for the collection of quantum dot fluorescence.The fluorescence energy of the quantum dot is enhanced,the directional radiation of the quantum dot is also controlled,and the relevant regulatory parameters were obtained.The research results in this paper have important reference price value for many fields such as nano-integrated optical waveguide devices,optocouplers,photodetectors,photovoltaics and photodetectors.