title: Mode selection in electrically driven quantum dot microring cavities.
abstract: Within this paper a novel method for selecting certain lasing modes from a whispering gallery mode (WGM) spectrum of electrically pumped microrings is presented. Selection is achieved by introducing sub-wavelength sized notches of about 50 nm width and 500 nm depth to the sidewalls of ring shaped quantum dot micro cavities with 80 µm diameter and ridge widths below 2 µm. It is shown that the notches act as scattering centers, suppressing modes that have maxima in intensity at the notch position. By a variation of the angle between the notches, different repetitive patterns of lasing modes and suppressed modes are conceivable.
authors.affiliation: Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Schlehahn
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Albert
authors.forename: Christian
authors.initials: C
authors.lastname: Schneider
authors.forename: Sven
authors.initials: S
authors.lastname: Höfling
authors.forename: Stephan
authors.initials: S
authors.lastname: Reitzenstein
authors.forename: Jan
authors.initials: J
authors.lastname: Wiersig
authors.forename: Martin
authors.initials: M
authors.lastname: Kamp