From Lennart Stenflo and Padma Shukla
Your article on invisibility and negative refraction says that the 1968 work by Victor Veselago was “the first time that anyone had thought of a way that light could be steered in ways beyond the power of conventional lenses and mirrors. However, nobody took much notice…” (17 February, p 38).
In fact, the well-known Soviet physicist Leonid Mandelshtam suggested similar ideas as early as 1940: see, for example, the 2006 review paper “Spatial dispersion and negative refraction of light” by Vladimir M. Agranovich and Yuri N. Gartstein (Physics-Uspekhi, vol 49, p 1029).
Umeå, Sweden
