Theory and simulations employing coupled-cavity rate equations in an active photonic lattice show excitation of coherent low frequency collective oscillations in the photon and carrier densities, analogous to photonic sound. For parameters just below the lattice stability threshold, long range wave propagation results from external excitation of a few cavities. Above threshold long range coherent oscillations are self-excited without external stirring.
©2004 Optical Society of America
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