Study On The Fabractionpre And Optical Properties Of Noble Metal Nanoparticle-quantum Dot Hybrid Arrays

The research of nanostructure and quantum dot composite structure of precious metals has been a hot issue in the world.The applications of the biomedical detection and solar cells and photoelectric display technology have been widely studied.The interaction of plasmon produced by the metal nanoparticles and the exciton interaction produced by the semiconductor quantum dots will produce many novel physical phenomena,such as the local field enhancement effect and the ultrafast electron transfer effect.These novel effects have attracted more and more attention in recent years due to the composite nanostructures composed of metal nanoparticles and quantum dots.In this paper,the preparation method of noble metal nanoparticle quantum dot composite array structure is mainly studied,and the Photoluminescence Characteristic of the composite structure is studied.By adjusting the polarization direction of the excitation luminescence,the angle between polarization of the excited luminescence and the polarization of the structure of the composite array of noble metal nanoparticles and quantum dots is changed,and the composite junction is made.The effect of noble metal nanoparticles on different quantum dots produced by fluorescence enhancement or attenuation.Then,the optical field intensity distribution of the noble metal nanoparticles array structure and the nanoparticle quantum dot composite array structure of noble metal nanoparticles and quantum dots is calculated by theoretical calculation and simulation.Secondly,the composite array structure composed of different quantum dots structure is used to test the fluorescence of the composite array structure under the polarization condition of the modified excited luminescence.The intensity of the fluorescence emission spectrum is compared with that of the quantum dot with or without the shell and the polarization state of the excited light.Finally,we briefly introduce the prospect of our composite structure in biomedical detection and solar cell application.This article is divided into the following parts:1.First,the analysis of the formula derivation and calculation simulation is carried out from three aspects: the critical evanescent standing wave light source is discussed in detail,and why the TE polarization 532 nm wavelength evanescent wave is selected as the light source;the whole laser evanescent standing wave system is analyzed,includingthe calculation of the polarization of the particle.The distribution of light field in the system is simulated,and the force of the particles in the light field is analyzed.At the same time,the principle of silver nanoparticle array deposition is briefly introduced.The interaction of metal nanoparticles and fluorescent materials is discussed and analyzed from the energy level,and the physical mechanism of metal enhanced fluorescein and metal quenching is also analyzed.2.Next,it is divided into two steps to describe in detail the whole process from the optical field to the preparation of the silver nanoparticle quantum dot composite array structure.In the preparation of the substrate of the silver nanoarray,the light field,the preparation steps involved in the preparation of the substrate and the morphology of the prepared structure are characterized by SEM,and the FDTD simulation calculation is carried out at the end with the ideal model as the template.3.At last,the fluorescence enhancement and quenching effect of the metal nanoparticles quantum dot composite array structure is studied by means of spectral testing.In the test,the polarity of the structure of the noble metal nanoparticles quantum dots composite array is considered.In the test,we choose to adjust the excitation mode to test the UV excitation of the composite structure.Fluorescence spectra.