24 August 2017 Coherence and dynamics of a high-β metallo-dielectric nanolasers
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Metal-clad nanolasers with high spontaneous emission factors (β) represent a class of ultra-compact light emitters with applications in fiber-optic communications, hybrid and all optical computing, imaging and sensing. In-depth studies on both the coherence and dynamical properties of these emitters are necessary before practical applications can be realized. However, the coherence characterization of a high-β nanolaser using the conventional measurement of output light intensity versus input pump intensity (L-L curve) is inherently difficult due to the diminishing kink in the measurement curve. We conducted the second order intensity correlation measurement, or g2(τ) - a more definitive method to confirm coherence - on a high-β metallo-dielectric nanolaser under nanosecond optical pulse pumping. Our result indicates that full coherence is achieved at three times the threshold conventionally defined by the kink in the L-L curve. Additionally, we observed that the g2(τ) peak width shrinks below and broadens above threshold. Rate-equation analyses reveal that the above-threshold broadening is due to the delayed threshold phenomenon, providing the first observation of dynamical hysteresis in a nanolaser. We propose that this dynamical phenomenon can be exploited to determine the lasing regimes of a unity-β nanolaser, whose threshold is inherently ambiguous and difficult to observe.
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Si Hui Pan, Qing Gu, Abdelkrim El Amili, Felipe Vallini, Yeshaiahu Fainman, "Coherence and dynamics of a high-β metallo-dielectric nanolasers", Proc. SPIE 10345, Active Photonic Platforms IX, 103450J (24 August 2017); doi: 10.1117/12.2272660; https://doi.org/10.1117/12.2272660

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