Long-time nanolasing at room temperature by the dark mode of a plasmonic lattice

This is the authors' abstract. We don't add key points for this paper.

Long-term stable room temperature nanolasing is critical for optoelectronic integrated devices and photonic integrated circuits. However, sustaining nanoscale lasers is challenging due to system losses in the nanocavity and thermal instability, leading to insufficient gain. In this work, we achieve long-term stable nanolasing supported by the dark mode of a plasmonic lattice sandwiched between an upper dye gain layer and a lower porous alumina membrane substrate. The observed dark mode lasing in a momentum-space imaging system is identified as the singlet A 1 mode of the Γ point through symmetry arguments. Due to the excellent heat dissipation of the components and porous nanostructures of the alumina membrane, combined with the extended coherence length of the dark mode, the liquid-dye-packaged laser system achieved 587.6 nm nanolasing for 21 min only with 0.2 mL volume and 10 mmol/L concentration. This work specifically addressed a longstanding problem in dye-based plasmonic nanolasers, achieving a breakthrough in lasing duration.