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arXiv · 2112.06257

Thermal Simulation and Experimental Analysis of Optically Pumped InP-on-Si Micro- and Nanocavity Lasers

Pengyan Wen·Preksha Tiwari·Markus Scherrer·Emanuel Lörtscher·Bernd Gotsmann·Kirsten E. Moselund
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Abstract

There is a general trend of downscaling laser cavities, but with high integration and energy densities of nanocavity lasers, signifi-cant thermal issues affect their operation. The complexity of geometrical parameters and the various materials involved hinder the extraction of clear design guidelines and operation strategies. Here, we present a systematic thermal analysis of InP-on-Si micro- and nanocavity lasers based on steady-state and transient thermal simulations and experimental analysis. In particular, we investi-gated the use of metal cavities for improving the thermal properties of InP-on-Si micro- and nanocavity lasers. Heating of lasers is studied by using Raman thermometry and the results agree well with simulation results, both reveal a temperature reduction of hundreds of kelvins for the metal-clad cavity. Transient simulations are carried out to improve our understanding of the dynamic temperature variation under pulsed and continuous-wave pumping conditions. The results show that the presence of a metal clad-ding not only increases the overall efficiency in heat dissipation, but also causes a much faster temperature response. Together with optical experimental results under pulsed pumping, we conclude that a pulse width of 10 ns and repetition rate of 100 kHz is the optimal pumping condition for a 2 micrometer wide square cavity.

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Pengyan Wen, Preksha Tiwari, Markus Scherrer, Emanuel Lörtscher, Bernd Gotsmann, Kirsten E. Moselund. 2021-12-12. Thermal Simulation and Experimental Analysis of Optically Pumped InP-on-Si Micro- and Nanocavity Lasers. https://arxiv.org/abs/2112.06257

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