The Characteristics Of Chiral Surface Plasmon Waveguide Mode And Derivative Devices

Currently,the network plays very important roles in our daily life.Its fast development put forward increasing demand on the capacity and the distribution speed of information.Although the capacity have already reached a surprising degree of 100 Tb/s for the single-core fiber,there is still needs to explore new kinds of waveguide and its derivative devices based on the novel materials,structures and mechanism.As a new mechanism,the effect of surface plasmon polaritons(SPPs)attracts much attention due to its ability to break through the diffraction limit,from which a series of novel waveguide devices appeared.From another aspect,the chiral medium,as a new sort of material,can make cooperation with SPPs and derive new kinds of waveguide and derivative devices.This thesis just devote to this direction and hope to make our own contribution in this field.In this thesis,the finite element method(FEM)is used to simulate the light behavior in the chiral surface plasmonic(SP)waveguide.The FEM-based basic equations suitable for chiral medium are deduced.According to the different structures of the SP waveguide such as MCM(metal-chiral-metal)and CMC(chiral-metal-chiral)planer waveguide and its derivative comb shaped waveguide,V-shaped wedge and groove waveguide,and dielectric loaded chiral SP waveguides,the waveguide physical characteristics including mode characteristics,dispersion relations are studied.In addition,two SP waveguide devices are designed such as the all-optical diode and nano-structured polarization converter.The study demonstrate that the chirality may improve the performance of light transmission in SP waveguides to a certain extent.Chirality can modulate the distribution of each component of field and the polarization distribution,effective index,field binding compared with achiral case.In addition,wavelength and the size of waveguide have influence on the polarization distribution which chirality modulate.