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Bosonic condensates offer exciting prospects for studies of non-equilibriumquantum dynamics. Understanding the dynamics is particularly challenging in thesub-picosecond timescales typical for room temperature luminousdriven-dissipative condensates. Here we combine a lattice of plasmonicnanoparticles with dye molecule solution at the strong coupling regime, andpump the molecules optically. The emitted light reveals three distinct regimes:one-dimensional lasing, incomplete stimulated thermalization, andtwo-dimensional multimode condensation. The condensate is achieved by matchingthe thermalization rate with the lattice size and occurs only for pump pulsedurations below a critical value. Our results give access to control andmonitoring of thermalization processes and condensate formation atsub-picosecond timescale.

Sub-picosecond thermalization dynamics in condensation of strongly coupled lattice plasmons