Abstract
The authors study coupled resonator optical waveguides (CROWs) to extend control of light propagation in photonic devices. Exploiting parity-time ($\mathcal{P}\phantom{\rule{0}{0ex}}\mathcal{T}$) symmetry of the waveguide allows selection of the group velocity and its dispersion for cavity modes. The researchers describe a scalable, controllable CROW with $\mathcal{P}\phantom{\rule{0}{0ex}}\mathcal{T}$ symmetry, which is induced by periodic and balanced amplification and absorption, and analyze its potential for switching from slow to fast light transport. With suitable tweaking, even superluminal propagation could be within reach.
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