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This paper introduces a new approach to neuromorphic photonics in whichmicrocavities exhibiting strong exciton-photon interaction may serve asbuilding blocks of optical spiking neurons. The experimental resultsdemonstrate the intrinsic property of exciton-polaritons to resemble the LeakyIntegrate-and-Fire spiking mechanism. It is shown that exciton-polaritonmicrocavities when non-resonantly pumped with a pulsed laser exhibitleaky-integration due to relaxation of the excitonic reservoir,threshold-and-fire mechanism due to transition to Bose-Einstein condensate, andresetting due to stimulated emission of photons. These effects, evidenced inphotoluminescence characteristics, arise within sub-ns timescales. Thepresented approach provides means for energy-efficient ultrafast processing ofspike-like laser pulses at the level below 1 pJ/spike.

Leaky Integrate-and-Fire Mechanism in Exciton-Polariton Condensates for Photonic Spiking Neurons