A Research Of Deposition Nano Array Structure Of Noble Metal And Optical Properties By Laser Standing Evanescent Wave Fields

In 1970, light-trapping and manipulation of micro-sized particles was first reported.Since then, it has been successfully applied to the micro and nano scales: the subwavelength scale, where light-matter coupling enables cooling of atoms, ions and molecules,and in the micrometer scale, where the momentum transfer resulting from light scattering allows manipulation of micros-objects such as cells. But it has been difficult to apply these techniques to the nanoscale-rang that includes structures such as quantum dots,nanowires, nanotubes, graphene and two-dimensional crystals, all of crucial importance for nanomaterials-based applications. Currently, however, several new approaches have been developed and demonstrated for trapping plasmonic nanoparticles, semiconductor nanowires and carbon nanostructures. In this paper we will introduce a new technology to trapping nanoparticles: ’optical tweezers’ add ’template’. We choose a cheap and simple approach of evanescent standing wave field with conservative periodic potential landscape optical template to fabrication of silver nanoparticles ordered array structure.Firstly, we should create optical template of the evanescent standing wave field with periodic potential though the theoretical calculation simulation. Then by according to the simulation results build the one-dimensional and the two-dimensional optical template system respectively. By using those templates, we fabricated two kinds of monolayer array structure, such as the nano-linear and the nano-dot array of particles structure. And a novel Ag-Au substrate was fabricated by Galvanic Replacement Reaction. Finally, we test the polarization Raman scattering spectra of structures that we fabrication. And comparing the intensity of polarization Raman scattering spectrum of the before with after annealing of the linear array structure.In this paper, there are several parts of components:1. We introduced a method of creating optical template, and the process of building its mechanism and deposited nanoparticles were analyzed in detail.2. On the basis of theoretical calculations we design and construction of one and two dimensional laser standing evanescent wave field as the optical template. By using those templates, we successfully fabricated two kinds of monolayer array structure, such as nano-linear array and the nano-dot structure. And a novel Ag-Au substrate was fabricated by Galvanic Replacement Reaction. Using scanning electron microscopy and optical microscopy on them Morphological characterization performed.3. In order to verify the orderly arrangement of nanoparticles,we fabricated three kinds of monolayer array structure: the nano-linear array, the nano-dot array and the Ag-Au substrate. We tested and compared the polarization Raman scattering spectra of those structures that we fabrication. And comparing the intensity of polarization Raman scattering spectra of the before with after annealing of the nano-linear array structure.Finally come to the conclusion for the orderly arrangement of particles.