Kim, Se-Heon and Huang, Jingqing and Scherer, Axel (2012) From vertical-cavities to hybrid metal/photonic-crystal nanocavities: towards high-efficiency nanolasers. Journal of the Optical Society of America B, 29 (4). pp. 577-588. ISSN 0740-8224 http://resolver.caltech.edu/CaltechAUTHORS:20120504-113613176
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We 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 6 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 μm reveals that a relatively high cavity Q of over 1000 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.
|Additional Information:||© 2012 Optical Society of America. Received September 1, 2011; revised December 1, 2011; accepted December 2, 2011; posted December 2, 2011 (Doc. ID 153695); published March 9, 2012. The authors would like to acknowledge support from the Defense Advanced Research Projects Agency under the Nanoscale Architecture for Coherent Hyperoptical Sources program under grant #W911NF-07-1-0277 and from the National Science Foundation through NSF CIAN ERC under grant #EEC-0812072.|
|Group:||Kavli Nanoscience Institute|
|Classification Code:||OCIS codes: 140.5960, 140.3945, 230.5298, 240.6680|
|Official Citation:||Se-Heon Kim, Jingqing Huang, and Axel Scherer, "From vertical-cavities to hybrid metal/photonic-crystal nanocavities: towards high-efficiency nanolasers," J. Opt. Soc. Am. B 29, 577-588 (2012) http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-4-577|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||08 May 2012 18:37|
|Last Modified:||26 Dec 2012 15:09|
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