Light focusing on a stack of metal-insulator-metal waveguides sharp edge.

Near field light focusing by two-dimensional isosceles triangle shaped stack of silver plasmon-polaritons waveguides is being investigated numerically with full-vectorial Finite Difference Time Domain method for H-polarized light and wavelength lambda = 500 nm. For wide angle of tip, results are in good agreement with theoretically predicted propagation constant of light in stack and while discrepancy becomes significant for smaller angle. Physical phenomena of refraction and interference, similar to ones in dielectric axicons lead to conversion of a Gaussian beam incident on the flat side of the stack into a narrow light jet behind the structure sharp edge.

Optimization of optical transmittance of a layered metamaterial on active pairs of nanowires.

Optical metamaterials with a negative value of the refractive index can be fabricated by means of patterning techniques developed for microelectronics. One of those is a layered metamaterial, where the electric and magnetic response comes from coupled parallel subwavelength size wires. We simulate propagation of EM waves through such a metamaterial.

FDTD simulations of 2D plasmon waveguide on silver nanorods in hexagonal lattice.

We present a 2D plasmon waveguide in the form of rows of silver nanorods in hexagonal lattice, that may be used for creating a medium with novel effective electromagnetic properties. Transport of energy due to surface plasmon coupling is investigated with Finite Difference Time Domain method for visible range wavelengths from 400 to 750 nm. For 500 to 750 nm range two-mode nature of the waveguide is shown in simulations.