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The regime of ultrastrong light-matter interaction has been investigatedtheoretically and experimentally, using zero-dimensional electromagneticresonators coupled with an electronic transition between two confined states ofa semiconductor quantum well. We have measured a splitting between the coupledmodes that amounts to 48% of the energy transition, the highest ratio everobserved in a light-matter coupled system. Our analysis, based on a microscopicquantum theory, shows that the nonlinear polariton splitting, a signature ofthis regime, is a dynamical effect arising from the self-interaction of thecollective electronic polarization with its own emitted field.

Ultra-Strong Light-Matter Coupling Regime with Polariton Dots