18 research outputs found
Tuning the Emission Directionality of Stacked Quantum Dots
The emission directionality of stacks of coupled quantum dots (QDs) is investigated within the framework of 8-band k·p-theory including strain and strain-induced piezoelectricity up to second order. Using an artificial cuboidal QD, we show that the degree of radiation anisotropy can be tuned from â33% to nearly +60% via the structureâs vertical aspect ratio. We then demonstrate that these findings can be transferred to stacked InGaAs QDs whose emission directionality is tailored (i) via the interdot coupling strength given by the separating barrier width and (ii) the number of stacked QDs. Our results enable the design and optimization of top and edge emitters based on stacked QDs.DFG, 43659573, SFB 787: Halbleiter - Nanophotonik: Materialien, Modelle, Bauelement
Komplexe PatientInnenfĂ€lle: Auswirkungen auf die Befindlichkeit von SimulationspatientInnen? [Bericht ĂŒber Forschungsergebnisse]
Recent re-oligotrophication in Mondsee (Austria) as indicated by sediment diatom and chemical stratigraphy
Scientific Reports / Facial Aesthetics in Young Adults after Cleft Lip and Palate Treatment over Five Decades
Cleft Lip and Palate (CLP) - a common facial malformation in newborns is typically corrected by surgical intervention to allow for normal speech development, psychosocial adjustment, and facial attractiveness. The long term treatment outcome can be evaluated after a number of years, possibly in adulthood. We investigated the aesthetics of the nasolabial region by subjective ratings. To compare various surgical approaches we recruited 12 raters to evaluate 429 patients. Expert and lay raters judged photographs from patients, who have completed treatment with one of three different surgical strategies performed in our institution over 50 years. Facial photographs were cropped, presented to the raters in a randomized sequence, and judged by the raters on a 5 point Likert scale. The subjective ratings between the raters revealed a fair to substantial inter-rater reliability. The average ratings of the surgical outcome improved continuously over the investigated 5 decades. Despite possible differences between raters and rater groups this overall result was consistently seen in the gender groups (male/female), or expertise related groups (expert/lay). Our analysis revealed that patients with bilateral CLP scored worse than patients with unilateral CLP when treated in the fifties; more recently treated patients of both groups scored similarly.(VLID)463726