title: High quality beaming and efficient free-space coupling in L3 photonic crystal active nanocavities.
abstract: 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.
authors.affiliation: Laboratoire de Photonique et de Nanostructures (CNRS UPR20), Route de Nozay, 91460 Marcoussis, France.
authors.forename: S
authors.initials: S
authors.lastname: Haddadi
authors.forename: L
authors.initials: L
authors.lastname: Le-Gratiet
authors.forename: I
authors.initials: I
authors.lastname: Sagnes
authors.forename: F
authors.initials: F
authors.lastname: Raineri
authors.forename: A
authors.initials: A
authors.lastname: Bazin
authors.forename: K
authors.initials: K
authors.lastname: Bencheikh
authors.forename: J A
authors.initials: JA
authors.lastname: Levenson
authors.forename: A M
authors.initials: AM
authors.lastname: Yacomotti
mesh_terms: D017076:Computer-Aided Design; D003460:Crystallization; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers