Design,Preparation And Raman Of Plasmonic Resonant Metamaterials

Nanophotonics is a heated international research currently,involving the study of various novel optical phenomena and properties at the nanoscale,and of the surface plasmon optics based on it.It's a interdisciplinary discipline covering physics,chemistry,materials,information,and bioscience.Except its small size,high integration,high speed and low cost,the devices based on plasmon resonance metameterials possess some special properties that traditional materials do not have.Therefore,it has aroused great concern of the researchers.The paper introduces the physical mechanism of surface plasmons,and carried out research work on the preparation and properties of plasmon resonance metamaterials,preparing the Raman substrates and light absorbing materials with the advantages of simple operation,low cost and high repetitiveness.It mainly includes the following aspects:1.It describes the physical mechanisms of the surface plasmon,such as the excitation mode,the dispersion relation and the related simulation calculation methods(including the finite-difference time-domain method and the finite element method of electromagnetic field).The prepared structure has been simulated with the finite-difference time-domain method.2.A gold nanoparticle array was obtained on the surface of a quartz sheet based on a simple annealing treatment,and the optical properties of the structure were investigated.Due to the plasmon resonance of the gold nanoparticles,the quartz films exhibit different colors and have strong enhanced Raman properties.The electromagnetic field distribution of gold nanoparticles is simulated by the theoretical calculation method of finite-difference time-domain,and further elucidate the Raman enhancement and the physical properties of the resonance absorption of gold nanoparticle arrays.3.Monodisperse silica microspheres are obtained with the chemical sol-gel method,and these silica microspheres are self-assembled to synthesize monolayer silica colloidal crystals at the same time.Then,after depositing a thin layer of gold on the colloidal crystals by magnetron sputtering and annealing treatment,a gold nanoshell structure with a high Raman hot spot is produced.It's optical performanceand its applications in Raman are aimed to be explored.4.Discrete gold nanoparticles are made by monocrystalline silicon,after which black silicon and gold composite nanostructure is obtained by metal-assisted chemical etching.Meanwhile,the physical properties of the black silicon and gold composite nanostructure are explored.These results have laid a good experimental basis for us to continue to conduct research further and produce high-performance Raman substrates and plasmon resonance absorbing metamaterials.