Surface Plasma Wave Propagation Direction And The Local Effects Of Modulation

Surface Plasmon (Surface Plasmon Polaritons, SPPs) are localized in the metal surface of a wave pattern, which consists of the metal surface of free electrons and photons (Photon) the formation of the electromagnetic coupling. Because it has the unusual physical properties caused widespread concern in academic circles. Using surface plasmon-related mechanism, design, the optical devices, optoelectronic components can be greatly reduced size. Meanwhile, the surface plasma waves in subwavelength optics, optical printing technique has wide application prospects.This paper uses two-dimensional dispersive FDTD method (2D-Dispersive FDTD Method) applications that are written independently, focusing on the structure of subwavelength metal surface plasmon wave transmission direction, phase control and other features. Work includes two-slit subwavelength metal structures SPPs phase modulation, SPPs in subwavelength metal structures and THz SPPs local orientation of excitation.The thesis research work and achievements include:(1) Using Drude dispersion model, dispersion based on two-dimensional finite difference time domain method in member of this group own simulation program compiled on the basis of a light source adapted to simulate certain incident angle and normal perspective of subwavelength silver film structure related to the optical properties of SPPs. The program realization of numerical simulation of adjustable light angle of incidence.(2) Engraved with the double-slit in the metal structure of two-dimensional surface plasmon wavelength phase conducted in-depth research. Using a similar Young's two-gap model, we set the two slit width of 55nm, light incident angle is 632.8nm. Change the incident angle of light source, we found that the incidence angle of 12°or 38°when the surface of the surface electromagnetic wave propagation in one direction, pushing these theories. Conductance and computer simulation work on the development of optical communication, plasma source, optical printing technology, there is guidance.(3) The THz wave, and near-infrared waves in subwavelength metal structures localized effect. For THz (frequency 0.9THz,0.8THz,0.7THz,0.6THz), the band's energy to local surface at different locations superconductors. Changes in temperature can regulate the energy of local position. For the dispersion medium silver, etching the surface of different Cao, near infrared light (wavelength of 1.33um,1.45um, 1.55um,1.65 um) localized on the metal surface a different location, change the ambient temperature can regulate the energy position of this information for future storage technology and optical communication technology of a theoretical guide.(4) THz subwavelength metal structures based on SPPs excitation direction was studied. Superconductors, the relative direction of etching the surface of two different depths of periodic Cao, electromagnetic waves (frequency 0.5THz, 1THz) at different frequencies in the superconductor surface can be spread in the corresponding direction. Micron surface using plasma technology, not only can enhance the intensity of incident light, increased transmission rates, but also to control the light propagation direction, light signals can regulate it for the future development of optical technology and optical communication technology of a theoretical guidance significance.