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15 February 2025
 
  » arxiv » 1109.0103

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From vertical-cavities to hybrid metal/photonic-crystal nanocavities: Towards high-efficiency nanolasers
Se-Heon Kim ; Jingqing Huang ; Axel Scherer ;
Date 1 Sep 2011
AbstractWe provide a numerical study showing that a bottom reflector is indispensable to achieve unidirectional emission from a photonic-crystal (PhC) nanolaser. First, we study a PhC slab nanocavity suspended over a flat mirror formed by a dielectric or metal substrate. We find that the laser’s vertical emission can be enhanced by more than a factor of six compared with the device in the absence of the mirror. Then, we study the situation where the PhC nanocavity is in contact with a flat metal surface. The underlying metal substrate may serve as both an electrical current pathway and a heat sink, which would help achieve continuous-wave lasing operation at room-temperature. The design of the laser emitting at 1.3 um reveals that relatively high cavity Q of over 1,000 is achievable assuming room-temperature gold as a substrate. Furthermore, linearly-polarized unidirectional vertical emission with the radiation efficiency over 50 % can be achieved. Finally, we discuss how this hybrid design relates to various plasmonic cavities and propose a useful quantitative measure of the degree of the ’plasmonic’ character in a general metallic nanocavity.
Source arXiv, 1109.0103
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