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We present an ultrafast all-optical gated amplifier, or transistor,consisting of a forest of ZnO nanowire lasers. A gate light pulse creates adense electron-hole plasma and excites laser action inside the nanowires.Source light traversing the nanolaser forest is amplified, partly as it isguided through the nanowires, and partly as it propagates diffusively throughthe forest. We have measured transmission increases at the drain up to a factor34 for 385-nm light. Time-resolved amplification measurements show that thelasing is rapidly self-quenching, yielding pulse responses as short as 1.2 ps.

Ultrafast all-optical gated amplifier based on ZnO nanowire lasing