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Enhancement of Parametric Effects in Polariton Waveguides Induced by Dipolar Interactions
D G Suárez-Forero1,2, F Riminucci2,3, V Ardizzone1
1CNR NANOTEC, Institute of Nanotechnology, Via Monteroni, 73100 Lecce, Italy.
Abstract:
Exciton-polaritons are hybrid light-matter excitations arising from the nonperturbative coupling of a photonic mode and an excitonic resonance. Behaving as interacting photons, they show optical third-order nonlinearities providing effects such as optical parametric oscillation or amplification. It has been suggested that polariton-polariton interactions can be greatly enhanced by inducing aligned electric dipoles in their excitonic part. However, direct evidence of a true particle-particle interaction, such as superfluidity or parametric scattering, is still missing. In this Letter, we demonstrate that dipolar interactions can be used to enhance parametric effects such as self-phase modulation in waveguide polaritons. By quantifying these optical nonlinearities, we provide a reliable experimental measurement of the direct dipolar enhancement of polariton-polariton interactions.
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