Optical Properties Of Chiral Nanostruction And Its Application In Optical Switch

The optical properties of chiral molecules is found in the nature,using its different response of mlecule structure under circularly polarized light to distinguish the material of structure.The new method for determine the molecular structure is more convenient than the traditional method, which break up the molecular to determine the molecular structure.Through the nanostructures by artificial to mimic the natural molecular structure and achieve some special performance.Research find that the chiral have good application prospects in many areas, such as biological pharmaceutical, chiral herbicides.chiral optical switch and so on, which attracted the interest of researchers.Current research to chiral structure are mainly concentrated in the spiral structure,and research the kind of chiral molecules is difficult,the manufacturing cost higher. Therefore we design the special chiral nanostructure, it gurantee the properties do not change of the chiral molecular,at the same time, make the structure shape more simple and optical characteristics more significant,finally chieve the goal that easy to maufacture and applied broader. In order to explore the application of the chiral optical switch provide the theoretical support.The main results of this paper are as followed.(1) Establish the two-dimensional chiral nanostructures model for theoretical analysis and research chiral nanostrure’s feature, such as the optical resonance under the far optical field and the electromagnetic field distribution under the near optical field.Analysis the model according the chiral nanostructuer theory and design perfect chiral nanostructure.Simulation calculate 2D chiral nanostucture’s response of spectrum under the left and right-hander polarized light under the far field.Ensure the influence of the structual parameter change. Through the analysis of 2D near-field charge distribution and electromagnetic field distribution,determine 2D nanostructures internal surface plasmons resonance method.(2) Construct a 3D simulation model of the nanostructure,and analysis its chiral potical feature.Through analysis the double chiral polymer, determine the main factors which affect the chiral character.Compared to 2D chiral nanostructures to analyzes thedimension’s influence for nanostructure optical character.