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Two‐dimensional confined photonic wire resonators – strong light–matter coupling
Author(s) -
SchmidtGrund Rüdiger,
Hilmer Helena,
Hinkel Annekatrin,
Sturm Chris,
Rheinländer Bernd,
Gottschalch Volker,
Lange Martin,
ZúñigaPérez Jesus,
Grundmann Marius
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945530
Subject(s) - nanopillar , materials science , scanning electron microscope , coupling (piping) , optics , photoluminescence , photonics , core (optical fiber) , exciton , optoelectronics , nanostructure , composite material , nanotechnology , condensed matter physics , physics
Oxide based Bragg reflector (BR) shells were grown conformally on various curved micro‐ and nanostructures by means of plasma‐enhanced chemical vapor deposition and pulsed laser deposition. The BR shells on circular‐cylindrical shaped glass‐rods exhibit an omnidirectional Bragg stop‐band, which was confirmed by spatially resolved ellipsometry. Single free standing hexagonally shaped GaAs and ZnO nanopillars coated with lateral concentric BRs represent two‐dimensionally confined photonic‐wire resonators (PWR). Spatially resolved PL experiments in dependence on the pillar diameter and the temperature provide strong hints for the ZnO PWR being in the strong‐coupling regime. The coupling strength can be estimated to be $V = 80\,{\rm meV}$ , reflecting the enhancement of the exciton–polariton coupling strength due to the reduction of the mode volume in such PWR.Left: Scanning electron microscopy image of a BR coated ZnO nanopillar. The insets show longitudinal and cross‐sectional cuts of such a PWR. Right: Spectra of the photoluminescence in dependence of the core cavity diameter d taken from the lateral surface of a ZnO PWR. The mode evolution indicates strong light–matter coupling.