The spontaneous breaking of mirror-symmetry in two coupled photonic crystal nanocavity-lasers is experimentally demonstrated. The inter-cavity evanescent coupling is tuned such that the nonlinear interaction –the carrier-induced nanolaser frequency shift– overcomes photon tunneling. This, together with the optimization of the nanocavity beaming, allows us to observe a spontaneous transition from a delocalized mode to two spatially localized states, in the form of a pitchfork bifurcation. Coexistence of these states is demonstrated through short pulse excitation. This kind of devices based on symmetry breaking could yield new types of flip-flop memories and nanolaser sources with strong photonic correlations.
Alejandro M. Yacomotti, Philippe Hamel, Fabrice Raineri, and Juan A. Levenson, "Spontaneous symmetry breaking in coupled photonic crystal nanolasers
(Conference Presentation)," Proc. SPIE 9920, Active Photonic Materials VIII, 99200C (Presented at SPIE Nanoscience + Engineering: August 28, 2016; Published: 9 November 2016); https://doi.org/10.1117/12.2236291.5159519963001.
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