Crossing the light line
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Updated: Jun 5, 2025

A Method for Lineage Tracing of Corneal Cells Using Multi-color Fluorescent Reporter Mice
Published on: December 18, 2015
John Pendry1, Paloma Huidobro2, Mario Silveirinha2
1Department of Physics, The Blackett Laboratory, Imperial College London, London, SW7 2AZ, UK.
Abstract:
We ask the question "what happens to Bloch waves in gratings synthetically moving at near the speed of light?". First we define a constant refractive index (CRI) model in which Bloch waves remain well defined as they break the light barrier, then show their dispersion rotating through 360° from negative to positive and back again. Next we introduce the effective medium approximation (EMA) then refine it into a 4-wave model which proves to be highly accurate. Finally using the Bloch waves to expand a pulse of light we demonstrate sudden inflation of pulse amplitude combined with reversal of propagation direction as a luminal grating is turned on.
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