RhoOnRubberZ527nm This movie shows a Plasmon Resonance of an isolated 20nm thick Gold spike structure in air. The structure is illuminated by unit amplitude CW plane wave incident from top and polarized along the long axis of the structure. A surface plot of Rho (Div E) slicing through the top face of the structure is shown. NOTE: this is the, short wavelength, low enhancment, "even mode" of the structure i.e. both ends of each spike have the same polarization. The resonant behavior of metallic nanostructures at optical wavelengths is of considerable interest. Geometry dependent surface polariton modes, excited in response to applied electromagnetic fields at specific wavelengths, produce large resonantly enhanced electric fields confined to a sub-wavelength region in the vicinity of sharp tips. Such metallic nanostructures can be used as near-field probes and sub diffraction limit imaging . To accurately resolve sub-wavelength geometrical features when modeling nanoscale photonic structures, we employ the AMR-FDTD method with local space and time grid refinement using a 3D grid interface interpolation algorithm that preserves the second-order accuracy of the original FDTD scheme and is stable for long time integration. Using Adaptive Mesh Refinement not only gives detailed access to the near field structure of the enhanced fields at the tips but also enables us examine the subtle relation between small geometry perturbations and resonant wavelength. Main Movie Page / PlasmonResonator / RhoOnRubberZ527nm.png Play This Movie (Select movie format from following list): mpg  wmv  previous movie [ dir ] next movie

Movie specs: 3.8MB MPEG 800x6000 30.000 fps 625.0 kbyte/s