Angle-Resonant Stimulated Polariton Amplifier. P. G. Savvidis, J. J. Baumberg, R. M. Stevenson, M. S. Skolnick, D. M. Whittaker and J. S. Roberts in Phys. Rev. Lett. 84:1547 (2000).  What the paper says!?

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This is one of the age-making papers of polaritonics, demonstrating stimulated scattering processes, by using two angles to pump the structure (pump and probe)

More controversially, the bosonic nature of the polaritons has recently been claimed to promote stimu lated scattering, allow Bose condensation, and potentially form a boser [3,5–7].