2003/02/20 by M. Kärkkäinen, M. K. Karkkainen, S. A. Tretyakov +9
Engineering · Physics and Astronomy · #Electromagnetic Simulation and Numerical Methods #Gyrotron and Vacuum Electronics Research #Microwave Engineering and Waveguides #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0302407
4 pages, figures
arxiv created 2003/02/20 · arxiv updated 2009/11/30
Numerical study of evanescent fields in an isotropic backward-wave (BW) (double negative or "left-handed") slab is performed with the FDTD method. This system is expected to be able to restore all spatial Fourier components of the spectrum of a planar source, including evanescent fields, realizing a "superlens". The excitation of surface modes on the interfaces of the slab, which is the key process responsible for the sub-wavelength focusing, is numerically confirmed and the time-domain field behavior is studied. In particular, a numerical verification of the amplification of evanescent modes by an isotropic BW slab with epsilon=mu=-1 is provided.