Polariton-polariton interaction potentials determination by pump-probe degenerate scattering in a multiple microcavity

Abstract : We study the polarisation-dependent polariton-polariton interaction through its effect on a parametric scattering process in a microcavity (MC). The ratio of the anti-circular interaction strength V2 over its co-circular counterpart V1 is involved in defining the regime in which many nonlinear processes arise in MCs, such as parametric conversion or condensation. We measure the ratio V2/V1 using a stimulated energy-degenerate parametric scattering process in a multiple MC. The sample is pumped at normal incidence, probed with a non-zero angle, and the phase-matched idler is observed at the opposite angle. The idler behaviour, both in power and polarisation, is compared to a hamiltonian interaction model that takes into account the two polarisation-dependent parametric scattering channels characterized by V1 and V2. The proposed method to measure the ratio V2/V1 is convenient and precise. The flexibility of the triple MC allows to observe the process and measure this ratio over a large range of detunings, where we find it to be highly dependent on the detuning. These measurements complement the previous study of Vladimirova et al. [Phys. Rev. B 82, 075301 (2010)] with an original approach and for detunings that were unexplored up to now.
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Physical Review B : Condensed matter and materials physics, American Physical Society, 2014, 89 (15), pp.5308. 〈10.1103/PhysRevB.89.155308〉
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Thimotée Lecomte, David Taj, Aristide Lemaitre, Jacqueline Bloch, Claude Delalande, et al.. Polariton-polariton interaction potentials determination by pump-probe degenerate scattering in a multiple microcavity. Physical Review B : Condensed matter and materials physics, American Physical Society, 2014, 89 (15), pp.5308. 〈10.1103/PhysRevB.89.155308〉. 〈hal-01066303〉

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