Journal
OPTICS EXPRESS
Volume 20, Issue 17, Pages 18876-18886Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.018876
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- Region Ile-de-France
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We report on far-field measurements of L3 photonic crystal (PhC) cavities with high quality beaming. This is achieved by means of the so-called band folding technique, in which a modulation of the radius of specific holes surrounding the cavity is introduced. Far-field patterns are measured from photoluminescence of quantum wells embedded in the PhC. A very good agreement between experimental results and simulated radiation patterns has been found. Laser effect is demonstrated in the beaming cavity with a threshold comparable to the regular one. In addition, free-space input coupling to this cavity has been achieved. In order to fully analyze the coupling efficiency, we generalize the approach developed in S. Fan, et al., [J. Opt. Soc. Am. A 20, 569 (2003)], relaxing the hypothesis of mirror symmetry. The obtained coupling efficiencies are about 15% with quality factors (Q) exceeding 10(4). These results further validate the folding technique on L3 cavities for nanocavity realization with efficient free-space coupling and high Q factors. (C) 2012 Optical Society of America
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