Optical Properties Of Periodic Magnetoelectric Scattering Lattice

Nano-optical antenna is a new type of optical devices,which can convert the energy of free propagating radiation to localized energy,and vice versa.Optical antennas usually have the form of metallic nanoparticles and their properties may be strongly shape and material dependent owing to surface plasmon resonances.Based on these,optical antennas have important applications such as nanoscale imaging and spectroscopy,photovoltaics and coherent control.This thesis have the following achievements:1.The scatter properties of metal are studied.Based on Mie theory and quasi static approximation,two methods for extracting the polarizability tensor are developed,and the pros and cons of which are described specifically.2.A one-dimensional nano-optical antennas long-chain coupled to an infinite metal waveguide system has been studied.Transfer matrix method as well as Bloch periodic condition are used to calculate the band structure in Brillouin zone of this system.3.A two-dimensional nano-optical antennas array coupled to stratified structure has been designed,the couple between different particles and between particle and stratified structure have been analyzed.The background fields and scattered fields are computed via dyadic Green's function,in order to calculate the total transmittance and reflectance.Finally,comparison between the computation results by our method and COMSOL simulation is given and they show an excellent match,which proves that the method in this thesis has a good accuracy in the analysis of lattice in stratified structures.