New Journal of Physics (Jan 2018)

Polariton condensation in photonic crystals with high molecular orientation

  • D V Karpov,
  • I G Savenko

DOI
https://doi.org/10.1088/1367-2630/aaa750
Journal volume & issue
Vol. 20, no. 1
p. 013037

Abstract

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We study Frenkel exciton-polariton Bose–Einstein condensation in a two-dimensional defect-free triangular photonic crystal with an organic semiconductor active medium containing bound excitons with dipole moments oriented perpendicular to the layers. We find photonic Bloch modes of the structure and consider their strong coupling regime with the excitonic component. Using the Gross–Pitaevskii equation for exciton polaritons and the Boltzmann equation for the external exciton reservoir, we demonstrate the formation of condensate at the points in reciprocal space where photon group velocity equals zero. Further, we demonstrate condensation at non-zero momentum states for transverse magnetic-polarized photons in the case of a system with incoherent pumping, and show that the condensation threshold varies for different points in the reciprocal space, controlled by detuning.

Keywords