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Demonstration of dipolar-induced enhancement of parametric effects in polariton waveguides

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posted on 2023-11-30, 19:51 authored by Daniel G. Suárez-Forero, Fabrizio Riminucci, Vincenzo Ardizzone, Nicholas Karpowicz, Eugenio Maggiolini, Guido Macorini, Giovanni Lerario, Francesco Todisco, Milena De Giorgi, Lorenzo Dominici, Dario Ballarini, Kenneth West, Loren Pfeiffer, Giuseppe Gigli, Alessandra S. Lanotte, Daniele Sanvitto
Exciton-polaritons are hybrid light-matter excitations arising from the non-perturbative 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 work, 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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