20 August 2009 Highly directional emission from ultra-small photonic crystal resonators
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Abstract
Here, we emphasize the importance of a bottom reflector for achieving unidirectional far-field emission. As a result, over 80% of photons generated inside the cavity can be collected within a divergence angle of ±30° from the top. We also discuss interesting analogy in which the nanocavity-bottom reflector coupled system is treated as a point-like emitter in front of a mirror. Based on such a view point, the observed directivity is explained by using a comprehensive interference model. Finally, we propose a very practical form of an efficient photonic crystal nanolaser bonded on a flat metal surface, which may enable current injection and room-temperature continuous-wave operation.
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Se-Heon Kim, Yong-Hee Lee, Jingqing Huang, Axel Scherer, "Highly directional emission from ultra-small photonic crystal resonators", Proc. SPIE 7402, Nanoengineering: Fabrication, Properties, Optics, and Devices VI, 74020G (20 August 2009); doi: 10.1117/12.826561; https://doi.org/10.1117/12.826561
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