Article Dans Une Revue Physical Review Applied Année : 2020

Strong Coupling of Exciton-Polaritons in a Bulk GaN Planar Waveguide: Quantifying the Coupling Strength

Laetitia Doyennette
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Geoffrey Kreyder
François Réveret
Pierre Disseix
François Médard
Joël Leymarie
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Résumé

We investigate the demonstration and quantification of the strong coupling between excitons and guided photons in a GaN slab waveguide. The dispersions of waveguide polaritons are measured from T = 6 to 300 K through gratings. They are carefully analyzed within four models based on different assumptions, in order to assess the strong-coupling regime. We prove that the guided photons and excitons are strongly coupled at all investigated temperatures, with a small (11%) dependence on the temperature. However, the values of the Rabi splitting strongly vary among the four models: the "coupled oscillator" model overestimates the coupling; the analytical "Elliott-Tanguy" model precisely describes the dielectric susceptibility of GaN near the excitonic transition, leading to a Rabi splitting equal to 82 ± 10 meV for fundamental transverse-electric mode; the experimental ellipsometry-based model leads to smaller values of 55 ± 6 meV. We evidence that, for waveguides including active layers with large oscillator strengths, as required for room-temperature polaritonic devices, a strong bending of the modes' dispersion is not necessarily the signature of the strong coupling, which requires for its reliable assessment a precise analysis of the material dielectric susceptibility.

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hal-03034132 , version 1 (01-12-2020)

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Christelle Brimont, Laetitia Doyennette, Geoffrey Kreyder, François Réveret, Pierre Disseix, et al.. Strong Coupling of Exciton-Polaritons in a Bulk GaN Planar Waveguide: Quantifying the Coupling Strength. Physical Review Applied, 2020, 14 (5), pp.054060. ⟨10.1103/physrevapplied.14.054060⟩. ⟨hal-03034132⟩
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