What are the left-handed media and what is interesting about them?
K.Yu. Bliokh a
Yu.P. Bliokh b
a Institute of Radio Astronomy, National Academy of Sciences of Ukraine, ul. Krasnoznamennaya, 4, Khar'kov, 61002, Ukraine
b Department of Physics, Technion (Israel Institute of Technology), Technion City, IL-32000, Haifa, Israel
We review the intensively discussed ideas about wave propagation and refraction in media where both electric permittivity and magnetic permeability are negative. The
criticism against negative refraction as violating the causality principle is considered. Starting from the initial wave equations, refraction of beams at the boundary of a left-handed medium is analyzed. The physics of a perfect lens
formed by a flat layer of a left-handed material is considered.