Pendry et al. were able to show that a three-dimensional array of intersecting, thin wires could be used to create negative values of permittivity (or "ε"), and that a periodic array of copper split ring resonators could produce an effective negative magnetic permeability (or "μ").
John Pendry (born 4 July 1943), English theoretical physicist
Just before this prism experiment, Pendry et al. was able to demonstrate that a three-dimensional array of intersecting thin wires could be used to create negative values of ε.
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In an article in Cheshire Life in June 2004, Pendry reveals that he was born in relatively comfortable circumstances in Broadstairs, Kent, attending school at St Augustine's Abbey.