We report on a platform for the production of single photon devices with a fabrication yield of 100%. The sources are based on InAsP quantum dots embedded within position-controlled bottom-up InP nanowires. Using optimized growth conditions, we produce large arrays of structures having highly uniform geometries. Collection efficiencies are as high as 83% and multiphoton emission probabilities as low as 0.6% with the distribution away from optimal values associated with the excitation of other charge complexes and re-excitation processes, respectively, inherent to the above-band excitation employed. Importantly, emission peak lineshapes have Lorentzian profiles indicating that linewidths are not limited by inhomogeneous broadening but rather pure dephasing, likely elastic carrier-phonon scattering due to a high phonon occupation. This work establishes nanowire-based devices as a viable route for the scalable fabrication of efficient single photon sources and provides a valuable resource for hybrid on-chip platforms currently being developed.
Résumé
Kaléidoscope et Trivialités se démarquent des précédents recueils de Michel Beaulieu par l’importance de l’érotisme comme exploration de soi. Isabelle Miron, dans cet article, s’intéresse au lien entre le temps et la souffrance dans l’oeuvre du poète, et propose d’observer, dans ce qu’elle désigne comme une « poétique du monologue intérieur » comment, dans les poèmes de Beaulieu, les rapports érotiques permettent de se soustraire à l’emprise du temps. À l’image de toute son oeuvre, cet échappatoire se caractérise par l’ambiguïté que l’on retrouve chez Schopenhauer : à la fois « affirmation et négation du vouloir-vivre ».
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