Simulation of Localized surface plasmons

A cool simulation using FDTD showing the excitaion of Localized Surface Plasmons in metal nanorods. These simulations are done by Prof. Maxim Sukhrev. The external electromagnetic wave excites plasmons (oscillation of electron sea in the particle) in the direction of polarization of incident wave. At a certain resonance frequency of incoming light (which depends on the shape, size and environment), the particle exhibits large scattering and absorption. It also leads to large enhancements in electric field at the surface. To know more about localized surface plasmons, read my upcoming articles in my plasmonics information center.

Surface Plasmons (SP’s)

Surface plasmons (SP’s) are electromagnetic waves that propagate at the interface between metals (such as Ag, Au ) and dielectric material. Here I have simulated the propagation of surface plasmons on Ag-air interface, the color indicates the magnitude of electric field (blue for positive and red for negative).  I have used MEEP  (a FDTD program that solves for Maxwells equations on numerical grid) to simulate these electric field distribution of these special waves. The source for SP’s is a point dipole and is placed at the center. It is easier to excite SP’s in numerical simulation, however to excite them Read More …

Plasmonic coupling of electromagnetic energy in hexagonal array of silver nanorods

A cool animation which I reproduced from W.M Saj, Optics Express, Vol 13, 13, 2005 using freely obtained FDTD software (MEEP). It demonstrates the propagation of electromagnetic energy in hexagonal array of silver nanorods due to plasmonic coupling. The source is offset from the center and the energy is propagated in an interesting snake like pattern. For more details about this kind of propagation,  look at the article (W.M Saj, Optics Express, Vol 13, 13, 2005).