Group front evolution of Gaussian beam refracted from a right- to left-handed medium.
Amplitude enhancement in a group front of continuous wave (CW) Gaussian beam refracted at the boundary of right- and left-handed media is observed. Behind the interface plane in a high dispersion double negative medium the individual Fourier components of the beam diffract at different angles and have diversified phase speeds. This results in the group front build-up that propagates on with the beam and moves sideways with respect to the group velocity direction, where energy is transported. The enhancement is illustrated with 2-D simulations using finite difference time domain (FDTD) method.
Pniewski
Jacek
J
Szoplik
Tomasz
T