Customizing the refractive index of wells and barriers in a periodic array of quantum wells yields a way to control the reflectivity and dispersion of an excitonic lattice. The result is a new method for slowing or modulating light.
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Gibbs, H., Khitrova, G. Excitonic lattice control. Nature Photon 3, 613–615 (2009). https://doi.org/10.1038/nphoton.2009.200