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Proceedings Paper

Coherence and dynamics of a high-β metallo-dielectric nanolasers
Author(s): Si Hui Pan; Qing Gu; Abdelkrim El Amili; Felipe Vallini; Yeshaiahu Fainman
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Paper Abstract

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.

Paper Details

Date Published: 24 August 2017
PDF: 7 pages
Proc. SPIE 10345, Active Photonic Platforms IX, 103450J (24 August 2017); doi: 10.1117/12.2272660
Show Author Affiliations
Si Hui Pan, Univ. of California, San Diego (United States)
Qing Gu, Univ. of California, San Diego (United States)
The Univ. of Texas at Dallas (United States)
Abdelkrim El Amili, Univ. of California, San Diego (United States)
Felipe Vallini, Univ. of California, San Diego (United States)
Yeshaiahu Fainman, Univ. of California, San Diego (United States)

Published in SPIE Proceedings Vol. 10345:
Active Photonic Platforms IX
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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